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CH3C-=Choverset(NaNH2)toAoverset(CH3CH2B...

`CH_3C-=Choverset(NaNH_2)toAoverset(CH_3CH_2Br)toB`
Identify the product B.

A

pent-2-ene

B

pent-2-yne

C

pent-1-yne

D

pentane

Text Solution

Verified by Experts

The correct Answer is:
B


`CH_3C-=Choverset(NaNH_2)to` ltbr The first step is an acid-base reaction. The amide ion, `NH_2^(-)` [The anion of a very weak acid ammonia `(pk_a=38)`, is able to remove the acetylenic `H's` of terminal alkynes `(pk_a=25)` as protons. sodium alkynides are useful intermediates for the synthesis of higher alkynes. These syntheses are accomplished by treating sodim alkynide with a primary alkyl halide:
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