JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 24 February 2021, Shift 2, Chemistry Q46

Question 46 of 90 in this shift, Chemistry question 16 of 30, Section A.

[Reaction scheme: reactant

\xrightarrow{?}

product] Which of the following reagent is suitable for the preparation of the product in the above reaction ?

The figure, in words

Drawn skeletal structures. Reactant: six-membered ring with a C=O (O drawn at lower right), a ring C=C double bond adjacent to the C=O carbon on the lower left, a methyl line at the bottom on the double-bond carbon, and a C(=CH2)-CH3 group drawn at the top ring carbon. Product: the same skeleton with the C=O replaced by a plain ring CH2 (no oxygen), ring C=C and bottom methyl line and top C(=CH2)-CH3 group unchanged. Arrow labelled with a question mark.

(1) $\mathrm{NaBH_4}$
(2) $\mathrm{NH_2-NH_2/C_2H_5\overset{\ominus}{O}\overset{\oplus}{Na}}$ Official answer
(3) $\mathrm{Ni/H_2}$
(4) $\mathrm{Red\ P + Cl_2}$

Official answer

Option 2

NTA final key.

Chapter: Aldehydes, Ketones and Carboxylic Acids
Topic: Alkanes and Free Radicals
Idea tested: Wolff-Kishner Reduction to Alkanes

JEE Main 24 February 2021, Shift 2, Chemistry Q46

Same idea in other shifts