JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

\( \mathrm{R{-}CN \xrightarrow[ii)\ H_2O]{i)\ DIBAL{-}H} R{-}Y} \)
Consider the above reaction and identify “Y”.

Consider the above reaction, compound B is:

Given below are two statements :
Statement-I : Aniline is less basic than acetamide.
Statement-II : In aniline, the lone pair of electrons on nitrogen atom is delocalized over benzene ring due to resonance and hence less available to a proton.
Choose the most appropriate option :

Identify \( A \) in the following reaction.

The correct structures of A and B formed in the following reactions are :

The total number of amines among the following which can be synthesized by Gabriel synthesis is _____.

A reaction of \( 0.1 \) mole of Benzylamine with bromomethane gave \( 23 \, \text{g} \) of Benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed in this reaction are \( n \times 10^{-1} \), when \( n = \) ____________. (Round off to the Nearest Integer).
[Given: Atomic masses: \( \text{C} : 12.0 \, \text{u} \), \( \text{H} : 1.0 \, \text{u} \), \( \text{N} : 14.0 \, \text{u} \), \( \text{Br} : 80.0 \, \text{u} \)]

In the reaction of hypobromite with amide, the carbonyl carbon is lost as:

The correct sequence of correct reagents for the following transformation is:

Primary, secondary and tertiary amines can be separated using :

Given below are two statements, one is labelled as Assertion (A) and other is labelled as Reason (R).
Assertion (A): Gabriel phthalimide synthesis cannot be used to prepare aromatic primary amines.
Reason (R): Aryl halides do not undergo nucleophilic substitution reaction.
In the light of the above statements, choose the correct answer from the options given below:

Reagent, \( 1 \)-naphthylamine and sulphanilic acid in acetic acid is used for the detection of:

Compound \( A \) is converted to \( B \) on reaction with \( \mathrm{CHCl_3} \) and \( \mathrm{KOH} \). The compound \( B \) is toxic and can be decomposed by \( C \). \( A \), \( B \) and \( C \) respectively are:

The major product of the following reaction is:

In gaseous triethyl amine the "\( \mathrm{-C-N-C-} \)" bond angle is _______ degree.

An organic compound “\( A \)” on treatment with benzene sulphonyl chloride gives compound \( B \), \( B \) is soluble in dil. \( \mathrm{NaOH} \) solution. Compound \( A \) is:

Consider the above reaction, the Product “P” is:

Which of the following reaction is an example of ammonolysis?

What is the major product “\( P \)” of the following reaction?

Hoffmann bromamide degradation of benzamide gives product A, which upon heating with \( \mathrm{CHCl_3} \) and \( \mathrm{NaOH} \)

Statement I: Sodium hydride can be used as an oxidizing agent.
Statement II: The lone pair of electrons on nitrogen in pyridine makes it basic.
Choose the CORRECT answer from the options given below:

In the chemical reactions given above \( A \) and \( B \) respectively.

Consider the above reaction, X and Y respectively are:

Which one of the following reactions does not occur?

Consider the given reaction, percentage yield of:

Which of the following is not a correct statement for primary aliphatic amines?

What is the correct sequence of reagents used for converting nitrobenzene into m-dibromobenzene?

Ammonolysis of Alkyl halides followed by the treatment with NaOH solution can be used to prepare primary, secondary and tertiary amines. The purpose of NaOH in the reaction is:

The major product formed in the following reaction is:

The total number of reagents from those given below, that can convert nitrobenzene into aniline is __________. (Integer answer)
\( \mathrm{I.}\ \mathrm{Sn} - \mathrm{HCl} \)
\( \mathrm{II.}\ \mathrm{Sn} - \mathrm{NH_4OH} \)
\( \mathrm{III.}\ \mathrm{Fe} - \mathrm{HCl} \)
\( \mathrm{IV.}\ \mathrm{Zn} - \mathrm{HCl} \)
\( \mathrm{V.}\ \mathrm{H_2} - \mathrm{Pd} \)
\( \mathrm{VI.}\ \mathrm{H_2} - \text{Raney Nickel} \)

The major products \( A \) and \( B \) in the following set of reactions are:

What is A in the following reaction?

In the above reactions, product A and product B respectively are:

The structure of X is:

Which one of the products of the following reactions does not react with Hinsberg reagent to form sulphonamide?

Identify correct A, B and C in the reaction sequence given below:

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

Consider the above chemical reaction and identify product “A”:

In the above reaction, the structural formula of (A), “X” and “Y” respectively are :

Which one of the following gives the most stable Diazonium salt?

The diazonium salt of which of the following compounds will form a coloured dye on reaction with \( \beta \)-Naphthol in \( \mathrm{NaOH} \)?

← PreviousQuestion 25 of 41Next →

JEE Main 2021 18th March Evening Shift

Consider the given reaction, percentage yield of: