JEE Main · 2020 · 07 Jan 2020 · Shift 1 · Chapter_pending

What is the product of following reaction?

(A)(see structure)
(B)(see structure)
(C)(see structure)
✓ Correct
(D)(see structure)

Answer: (C)

Solution

Lindlar's catalyst — palladium on calcium carbonate poisoned with lead — is deliberately deactivated so it reduces an alkyne only as far as the alkene and delivers the two hydrogens to the same face. The triple bond is therefore converted to a cis-alkene with the carboxylic acid group left untouched.

JEE Main · 2020 · 07 Jan 2020 · Shift 1 · Single correct option

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