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JEE Mains | PYQ

The products formed in the following reaction, \( A \) and \( B \) are

Tow moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous \( \text{NaOH} \) after heating gives \( x \) as the major product. The number of \( \pi \) bonds in the product \( x \) is______________.

Aldol condensation is a popular and classical method to prepare \( \alpha, \beta \)–unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?

Consider the above reaction, the product ‘\( X \)’ and ‘\( Y \)’ respectively are:

In the given reactions, identify the reagent A and reagent B.

The products formed in the above reaction are:

For the compounds:

The increasing order of boiling point is:
Choose the correct answer from the options given below:

The mass of \( \mathrm{NH_3} \) produced when \( 131.8 \, \text{kg} \) of cyclohexane carbaldelhyde undergoes Tollen’s test is ____ \( \text{kg} \). (Nearest Integer)
Molar Mass of \( \mathrm{C} = 12 \, \text{g}/ \, \text{mol} \)
\( \mathrm{N} = 14 \, \text{g} \, /\text{mol} \)
\( \mathrm{O} = 16 \, \text{g} \,/ \text{mol} \)

Consider the above reaction sequence and identify the major product \( P \).

Cyclohexylamine when treated with nitrous acid yields (P). On treating (P) with PCC results in (Q). When (Q) is heated with dil. NaOH we get (R) The final product (R) is:

[where \( \mathrm{Et \Rightarrow -C_2H_5} \), \( \mathrm{{}^t}Bu{ \Rightarrow (CH_3)_3C^-} \)]
Consider the above reaction sequence, Product “A” and Product “B” formed respectively are:

m-chlorobenzaldehyde on treatment with \( 50\% \) \( \mathrm{KOH} \) solution yields

‘\( x \)’ is the product which is obtained by the hydrolysis of prop-\( 1 \)-yne in the presence of mercuric sulphate under dilute acidic medium at \( 333 \, \text{K} \). ‘\( y \)’ is the product which is obtained by the reaction is ethane nitrile with methyl magnesium bromide in dry ether followed by hydrolysis. IUPAC name of product obtained from ‘\( x \)’ and ‘\( y \)’ in the presence of barium hydroxide followed by heating is:

Given below are two statements one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): can be subjected to Wolff-Kishner reduction to given
Reason (R): Wolff-Kishner reduction is used to convert
In the light of the above statements, choose the correct answer from the options given below :

The product \( (A) \) formed in the following reaction sequence is:

The density of the ligand present in the Fehling’s reagent is __________.

Find out the major product from the following reaction.

Given below are two statements:
Statement (I) : Vanillin will react with \( \mathrm{NaOH} \) and also with Tollen’s reagent.

Statement (II) : Vanillin  will undergo self aldol condensation very easily.

In the light of the above statements, choose the most appropriate answer from the options given below:

Both acetaldehyde and acetone (individually) undergo which of the following reactions?
\( \mathrm{A.} \) Iodoform Reaction       \( \mathrm{B.} \) Cannizzaro Reaction            \( \mathrm{C.} \) Aldol Condensation       \( \mathrm{D.} \) Tollen’s Test                  \( \mathrm{E.} \) Clemmensen Reduction
Choose the correct answer from the options given below:

In the Claisen-Schmidt reaction to prepare \( 351 \, \text{g} \) of dibenzalacetone using \( 87 \, \text{g} \) of acetone, the amount of benzaldehyde required is ____ \( \text{g} \). (Nearest integer)

The product "A" in the above reaction is:

Given below are the four isomeric compounds \( (P, Q, R, S) \).

Identify correct statements from below.
A. \( Q, R \) and \( S \) will give precipitate with \( 2,4\text{-DNP} \).
B. \( P \) and \( Q \) will give positive Bayer’s test.
C. \( Q \) and \( R \) will give sooty flame.
D. \( R \) and \( S \) will give yellow precipitate with \( I_2 / \mathrm{NaOH} \).
E. \( Q \) alone will deposit silver with Tollen’s reagent

Choose the correct option.

In the given reaction
(Where Et is \( -\mathrm{C_2H_5} \)).
The number of chiral carbon’s in product A is ______. 

Consider the following molecules:

The correct order of rate of hydrolysis is:

Consider the above reaction and predict the major product:

Grignard reagent \( \mathrm{RMgBr} \) (\( P \)) reacts with water and forms a gas (\( Q \)). One gram of \( Q \) occupies \( 1.4 \, \mathrm{dm^3} \) at STP. \( Q \) on reaction with dry ice in dry ether followed by \( \mathrm{H_3O^+} \) forms a compound (\( Z \)). \( 0.1 \) mole of (\( Z \)) will weigh ______ \( \mathrm{g} \). (Nearest integer)

Identify the name reaction.

In the given reaction,

The number of \( \pi \) electrons present in the product ‘P’ is _______.

This reduction reaction is known as:

Identify ‘A’ in the following reaction:

Find out the major products from the following reaction sequence.

Which of the following has highly acidic hydrogen?

Consider the following reaction of benzene.

In compound \( (Q) \), the percentage of oxygen is _____ \( \% \). \( \)(Nearest integer\( \))

Which among the following aldehydes is most reactive towards nucleophilic addition reactions?

The number of the correct reaction(s) among the following is _______.

The major product formed in the following reaction is:

I.
II.
III.
IV.

An organic compound “\( x \)” where molar ratio of \( \mathrm{C} \), \( \mathrm{O} \) and \( \mathrm{H} \) are equal, on treatment with \( 50\% \) \( \mathrm{KOH} \) under reflux followed by acidification produced “\( y \)”. The most likely structure of “\( y \)” is:

[Molar mass of “\( x \)” is \( 58 \) g \( \mathrm{mol}^{-1} \)]

Consider the given reaction, the product ‘X’ is:

Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?

The structures of A and B formed in the following reaction are: \( [\mathrm{Ph} = -\mathrm{C}_6\mathrm{H}_5] \)

The number of nitrogen atoms in a semicarbazone molecule of acetone is ______

\( 'x' \) is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. \( 'y'\) is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of \( 'x' \) and one mole of \( 'y' \) react with each other in the presence of alkali followed by heating?

Consider the above reaction, the major product ‘P’ is:

Match List - I with List - II.

Consider the above reaction sequence, the Product ‘C’ is:

Which among the above compound/s does /do not form Silver mirror when treated with Tollen’s reagent?

Compound ‘P’ on nitration with dil. \( \mathrm{HNO_3} \) yields two isomers (A) and (B). These isomers can be separated by steam distillation. Isomers (A) and (B) show the intramolecular and intermolecular hydrogen bonding respectively. Compound (P) on reaction with conc. \( \mathrm{HNO_3} \) yields a yellow compound ‘C’, a strong acid. The number of oxygen atoms is present in compound ‘C’ ___________.

Identify the product \( (P) \) in the following reaction:
 

A molecule \( (X) \) with following structure under mild acidic condition is hydrolyzed to produce \( (Y) \) and \( (Z) \). Identify the correct statements about \( (Y) \) and \( (Z) \).



A. Both \( (Y) \) and \( (Z) \) have same molar mass.

B. \( (Y) \) and \( (Z) \) can be distinguished from each other by \( \mathrm{NaHCO_3} \).

C. \( (Y) \) and \( (Z) \) react with \( \mathrm{HCN} \) with same rates.

D. \( (Y) \) and \( (Z) \) undergo addition reaction with \( 2,4\text{-DNP} \).

Choose the correct answer from the options given below:

Highest enol content will be shown by:

In the Claisen-Schmidt reaction to prepare, dibenzalacetone from \( 5.3 \, \mathrm{g} \) of benzaldehyde, a total of \( 3.51 \, \mathrm{g} \) of product was obtained. The percentage yield in this reaction was ________

The structures of major products \( \mathrm{A} \), \( \mathrm{B} \) and \( \mathrm{C} \) in the following reaction are sequence.

The product \( (P) \) formed in the following reaction is:

Given below are two statements:
Statement I: Fructose does not contain an aldehydic group but still reduces Tollen's reagent.
Statement II: In the presence of base, fructose undergoes rearrangement to give glucose.
In the light of the above statements, choose the correct answer from the options given below

The compound formed by the reaction of ethanal with semi carbazide contains _______ number of nitrogen atoms.

Identify the product in the following reaction:

In Tollen’s test for aldehyde, the overall number of electrons transferred to the Tollen’s reagent formula, \( [\mathrm{Ag(NH_3)_2}]^+ \) per aldehyde group to form silver mirror is_____.

The structure of the starting compound P used in the reaction given below is:

From the compounds given below, number of compounds which give positive Fehling’s test is __________.
Benzaldehyde, Acetaldehyde, Acetone, Acetophenone, Methanal, \( 4 \)-nitrobenzaldehyde, cyclohexane carbaldehyde.

Consider the above reaction sequence and identify the product B.

Given below are two statements:
Statements I: Acidity of \( \alpha \)-hydrogens of aldehydes and ketones is responsible for Aldol reaction.
Statements II: Reaction between benzaldehyde and ethanol will NOT give Cross-Aldol product.
In the light of the above statements, choose the most appropriate answer from the options given below:

In the above chemical reaction sequence “A” and “B” respectively are:

‘A’ formed in the above reaction is:

The major product ‘P’ for the following sequence of reactions is:

____________ grams of 3-Hydroxy propanal \( \text{MW} = 74 \) must be dehydrated to produce \( 7.8 \, \text{g} \) of acrolein \( \text{MW} = 56 \) \( \mathrm{C_3H_4O} \) if the percentage yield is \( 64 \). (Round off to the Nearest Integer).
[Given: Atomic masses: \( \text{C} : 12.0 \, \text{u} \), \( \text{H} : 1.0 \, \text{u} \), \( \text{O} : 16.0 \, \text{u} \)]

‘A’ and ‘B’ in the above reactions are: 

Oxidation of toluene to benzaldehyde can be easily carried out with which of the following reagents?

The unsaturated ether on acidic hydrolysis produces carbonyl compounds as shown below:

Based on this, predict the solution/reagent that will help to distinguish "P" and "Q" obtained in the following reaction:

Which of the following reagent is suitable for the preparation of the product in the above reaction?

The correct sequence of reagents for the preparation of \( Q \) and \( R \) is:

The final product \( A \) formed in the following multistep reaction sequence is:

Identify the reagents used for the following conversion.

The major products formed in the following reaction sequence A and B are:

Which among the following compounds give yellow solid when reacted with \( \mathrm{NaOI}/\mathrm{NaOH} \)?


Choose the correct from the options given below:

Identify A and B in the given chemical reaction sequence:

The value of \( x \) in compound ‘D’ is ____.

In the reaction given below

 ‘A’ is:

A molecule (“P”) on treatment with acid undergoes rearrangement and gives (“Q”). (“Q”) on ozonolysis followed by reflux under alkaline condition gives (“R”). The structure of (“R”) is given below:

The structure of (“P”) is:

When  undergoes intramolecular aldol condensation, the major product formed is:

Vanillin compound obtained from vanilla beans, has total sum of oxygen atoms and \( \pi \) electrons is ____________ .

Mesityl oxide is a common name of :

“P” is an optically active compound with molecular formula \( \mathrm{C_6H_{12}O} \). When “P” treated with \( 2,4 \)-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens reagent, “P” gives a negative test.
Predict the structure of “P”

Identify \( A \) and \( B \) in the following reaction sequence.

Which of the following is an example of conjugated diketone?

Match List-I with List-II.

Choose the correct answer from the options given below :

Major product of the following reaction is

The correct structure of product ‘\( A \)’ formed in the following reaction.

Given below are two statements:
Statement I: under Clemmensen reduction conditions will give

Statement II: under Clemmensen reduction conditions will give

The major product \( (P) \) in the following reaction is:

Which of the following reaction will yield benzaldehyde as a product?

Match List-I with List-II.

Choose the correct answer from the options given below:

Match List-I with List-II.

Choose the correct answer from the options given below:

Residue \( (A) + \mathrm{HCl{(dil)}} \rightarrow \) Compound \( (B) \)
Structure of residue \( (A) \) and compound \( (B) \) formed respectively is:

Given below are two statements:
Statement I: Cross aldol condensation between two different aldehydes will always produce four different products.
Statement II: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH, it forms a condensation product with acetophenone only.
In the light of the above statements, choose the correct answer from the options given below:

Which one of the following reactions does not represent correct combination of substrate and product under the given conditions?

Aman has been asked to synthesise the molecule \( (x) \). He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of performing ozonolysis reaction on alkene to produce a dicarbonyl compound followed by aldol reaction to prepare “\( x \)”. Predict the suitable alkene that can lead to the formation of “\( x \)”.

The structure of \( A \) in the given reaction is:

Which will have the highest enol content?

Given below are two statements:
Statement (I): On nitration of m-xylene with \( \mathrm{HNO_3} , \mathrm{H_2SO_4} \), followed by oxidation, \( 4 \)-nitrobenzene-\( 1, 3 \)-dicarboxylic acid is obtained as the major product.
Statement (II): \( -\mathrm{CH_3} \) group is o/p-directing while \( -\mathrm{NO_2} \) group is m-directing group.
In the light of the above statements, choose the correct answer from the options given below:

The compounds which give positive Fehling’s test are:

Choose the correct answer from the options given below:

A in the above reaction is:

Isobutyraldehyde on reaction with formaldehyde and \( \mathrm{K_2CO_3} \) gives compound 'A'. Compound 'A' reacts with \( \mathrm{KCN} \) and yields compound 'B', which on hydrolysis gives a stable compound 'C'. The compound 'C' is

"P" is a hydrocarbon of molecular formula :- \( \mathrm{C_8H_{14}} \). On ozonolysis, "P" forms "Q". "Q" on treatment with alkali under reflux condition produces "R", which on treatment with \( \mathrm{I_2/NaOH} \) gives a yellow precipitate. Acidification of the solution gives "S". The structure of "S" is given below:-

The correct structure of "P" is