JEE Main 2022 · 25 Jul · Shift 1 · Chemistry Q90

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ChemistryInteger+4 / -1Question 90 of 90

In the given reaction

(Where Et is $-\mathrm{C_2H_5}$ )

The number of chiral carbon/s in product A is ______.

Ethyl 1-methyl-2-(2-oxopropyl)cyclopentane-1-carboxylate treated with ethoxide gives A.

Your answer

Answer and worked solution

Official answer: 2

Intramolecular Claisen. The methyl-ketone enolate attacks the ester, closing a six-membered 1,3-dione fused to the cyclopentane. The two ring-fusion carbons are the chiral centres.

Answer: 2

Topics:Acid derivatives Optical isomerism and chirality

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JEE Main 2022 · 25 Jul · Shift 1, Chemistry question 90