Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202330 JanuaryEvening Shift
Exam
JEE Main
Year
2023
Date
30 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Hydrocarbons

JEE Main 2023 · 30 January · Evening Shift · Chemistry · Hydrocarbons

Given below are two statements: One is labelled as Assertion A and...

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: can can be easily reduced using Zn−Hg/HClZn - Hg / HCl to Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: can

Reason R: Zn−Hg/HClZn - Hg / HCl is used to reduce carbonyl group to –CH2{CH}_{2} – group.

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

Options

  1. AA is false but R is true
  2. BA is true but R is false
  3. CBoth A and R are true but R is not the correct explanation of A
  4. DBoth A and R are true and R is the correct explanation of A

Correct answer

A. A is false but R is true

Step-by-step solution

Clemmensen reduction: The carbonyl group of aldehydes and ketones is reduced to CH2{CH}_{2} group on treatment with zinc-amalgam and concentrated hydrochloric acid.

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: can

The acid sensitive alcohol group reacts with HClHCl, hence Clemmenson reduction is not suitable for above conversion.

So, assertion is false but reason is true.

Practice Hydrocarbons on Quantrex Academy →

More from Hydrocarbons

In the following reaction sequence, Q , R , S and T are the major products. The correct… JEE Advanced 2026Treatment of buta-1,3-diyne with NaNH_2 ( 2 equivalents), followed by reaction with… JEE Advanced 2026The List-II contains products obtained from the reaction of compounds in List-I with O_3… JEE Advanced 2026Natural rubber on complete ozonolysis ( O_3 /Zn- H_2O ) gives compound X as the major… JEE Advanced 2026An optically active alkyl bromide C _4 H _9 Br, reacts with ethanolic KOH to form major… JEE Main 2026An alkane (Y) requires 8 moles of oxygen for complete combustion and on chlorination with… JEE Main 2026R_f value for 2 -methylpropene in a solvent system (Ethyl acetate + ether) is 0.42 . 2… JEE Main 2026Given below are two statements: Statement I: Methane can be prepared by decarboxylation… JEE Main 2026 Full Hydrocarbons list All JEE Main PYQs