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1,2-Dibromopropane on treatment with X m...

1,2-Dibromopropane on treatment with X moles of NaNH_2` followed by treatment with ethyl bromide gave a pentyne. The value of X is

A

One

B

Two

C

Three

D

Four

Text Solution

Verified by Experts

The correct Answer is:
C
i) `CH_3CHBr - CH_2Br + 2NaNH_2 to CH_3C -= CH + 2NaBr + 2NH_3`
ii) `CH_3 C -= CH + NaNH_2 to CH_3C -= C^(-) Na^(+) + NH_3`
iii) `CH_3C -= C^(-) Na^(+) + CH_3CH_2 Br to CH_3C -= C CH_2 CH_3 + NaBr`
Thus 3 mole of `NaNH_2` is used .
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