JEE Mains JEE Advance BITSAT
JEE Advance | PYQ

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All years 2026 2022 2021

The major product formed in the following reaction is:

Considering the following reaction sequence, the correct statement(s) is(are):

Correct option(s) for the following sequence of reactions is(are):

For the following reaction scheme, percentage yields are given along the arrow:

\( x \; \text{g} \) and \( y \; \text{g} \) are mass of \( R \) and \( U \), respectively.
(Use: Molar mass (in \( \text{g mol}^{-1} \)) of \( \mathrm{H} \), \( \mathrm{C} \) and \( \mathrm{O} \) as \( 1 \), \( 12 \) and \( 16 \), respectively)
The value of \( x \) is ____.

The amount of energy required to break a bond is same as the amount of energy released when the same bond is formed. In gaseous state, the energy required for homolytic cleavage of a bond is called Bond Dissociation Energy (BDE) or Bond Strength. BDE is affected by s-character of the bond and the stability of the radicals formed. Shorter bonds are typically stronger bonds. BDEs for some bonds are given below:

Correct match of the C–H bonds (shown in bold) in Column J with their BDE in column K is:

Treatment of buta-\( 1,3 \)-diyne with \( \mathrm{NaNH_2} \) (\( 2 \) equivalents), followed by reaction with excess of trans–\( \mathrm{CH_3-CH=CH-CH_2-Br} \) gives \( X \) as the major product. The maximum number of carbon atoms that are collinear (in a straight line) in \( X \) is ______.

The amount of energy required to break a bond is same as the amount of energy released when the same bond is formed. In gaseous state, the energy required for homolytic cleavage of a bond is called Bond Dissociation Energy (BDE) or Bond Strength. BDE is affected by s-character of the bond and the stability of the radicals formed. Shorter bonds are typically stronger bonds. BDEs for some bonds are given below:

For the following reaction,
\( \mathrm{CH_4(g) + Cl_2(g) \xrightarrow{light} CH_3Cl(g) + HCl(g)} \)
the correct statement is:

The number of \( -\mathrm{CH}_2- \) (methylene) groups in the product formed from the following reaction sequence is _______.

The number of isomeric tetraenes (NOT containing \( sp \)-hybridized carbon atoms) that can be formed from the following reaction sequence is _______.

The total number of chiral molecules formed from one molecule of \( P \) on complete ozonolysis \( (\mathrm{O_3,\,Zn/H_2O}) \) is _______.

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JEE Advanced 2021 Paper - 1

The major product formed in the following reaction is: