JEE Main 2023 · ChemistryMultiple choiceAssertion–reasonMediumConceptual
JEE Main 11 April 2023, Shift 2, Chemistry Q77
Question 77 of 90 in this shift, Chemistry question 17 of 30, Section A.
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : [figure: skeletal ketone, a chain with a methyl branch, a carbon bearing Cl and a C=O group, i.e. (CH3)2CH-CH(Cl)-C(=O)-CH3] can be subjected to Wolff-Kishner reduction to give [figure: the corresponding skeletal chloroalkane (CH3)2CH-CH(Cl)-CH2-CH3]
Reason R : Wolff-Kishner reduction is used to convert [figure: >C=O (carbonyl carbon with two bonds drawn)] into [figure: >CH2 (CH2 with two bonds drawn)]
In the light of the above statements, choose the correct answer from the options given below:
The figure, in words
Assertion A shows a skeletal chloro-ketone, (CH3)2CH-CH(Cl)-C(=O)-CH3, and its Wolff-Kishner product, the chloroalkane (CH3)2CH-CH(Cl)-CH2CH3. Reason R shows >C=O converting into >CH2.- (1)Both A and R are true and R is the correct explanation of A
- (2)Both A and R are true but R is NOT the correct explanation of A
- (3)A is true but R is false
- (4)A is false but R is trueOfficial answer
Official answer
Option 4
NTA final key.
- Idea tested
- Wolff-Kishner Reduction to Alkanes