List of top Chemistry Questions on Reaction Mechanisms & Synthesis asked in JEE Main

In the Claisen-Schmidt reaction to prepare dibenzalacetone from 5.3 g benzaldehyde, a total of 3.51 g of product was obtained. The percentage yield in this reaction was _____.

The reaction \( \text{A}_2 + \text{B}_2 \to 2\text{AB} \) follows the mechanism: \[ \text{A}_2 \xrightarrow{k_1} \text{A} + \text{A} \, (\text{fast}), \quad \text{A} + \text{B}_2 \xrightarrow{k_2} \text{AB} + \text{B} \, (\text{slow}), \quad \text{A} + \text{B} \to \text{AB} \, (\text{fast}). \] The overall order of the reaction is:

The product A formed in the following reaction is:

What is the structure of C ?

Identify A and B in the given chemical reaction sequence : -

In the given reactions identify A and B.

The product Ⓒ in the following sequence of reactions has _______ π bonds.

Consider the given chemical reaction :

Product ''A'' is :

Consider the above reaction sequence and identify the major product P.

Which one of the following reactions is NOT possible?

Identify the major product in the following reaction.

Phthalimide is made to undergo following sequence of reactions.

Total number of \( \pi \) bonds present in product 'P' is/are ______

Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous NaOH after heating gives $x$ as the major product. The number of $\pi$ bonds in the product $x$ is ................

Given below are two statements:
Statement (I) : S$_N$2 reactions are 'stereospecific', indicating that they result in the formation only one stereo-isomers as the product.
Statement (II) : S$_N$1 reactions generally result in formation of product as racemic mixtures.
In the light of the above statements, choose the correct answer from the options given below :

The shape of carbocation is :

Identify the product A and product B in the following set of reactions.

Identify major product "X" formed in the following reaction :

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): SN$_2$ reaction of C$_6$H$_5$CH$_2$Br occurs more readily than the SN$_2$ reaction of CH$_3$CH$_2$Br.
Reason (R): The partially bonded unhybridized p-orbital that develops in the trigonal bipyramidal transition state is stabilized by conjugation with the phenyl ring.
In the light of the above statements, choose the most appropriate answer from the options given below:

In the following sequence of reaction, the major products B and C respectively are :

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

Identify the correct set of reagents or reaction conditions ‘X’ and ‘Y’ in the following set of transformation.

Identify the product in the following reaction :

Ionic reactions with organic compounds proceed through:
(A) Homolytic bond cleavage
(B) Heterolytic bond cleavage
(C) Free radical formation
(D) Primary free radical
(E) Secondary free radical
Choose the correct answer from the options given below:

Identify A and B in the following sequence of reaction.