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R-underset((A))-=--=-Roverset("Lindlar's...

`R-underset((A))-=--=-Roverset("Lindlar's catalyst" +H_2)rarr(B)`

Compounds (B) and (C) are:

A

B

C

D

(B) is (II) and (C) is (III)

Text Solution

Verified by Experts

The correct Answer is:
B
Hydrogenation of the triple bond to double bond by Lindlar's catalyst or by `P-2` or Brown catalyst, i.e. `H_2+Ni_2B` takes place by syn-addition, so the product is cis, cis(II).
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