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One mole of "1,2" -dibromobutane on trea...

One mole of `"1,2"` -dibromobutane on treatment with `"X"` moles of `NaNH_(2)` followed by treatment with ethyl bromide gave a hexyne.The value of `"X"` is:

A

one

B

two

C

three

D

four

Text Solution

Verified by Experts

(i)`CH_3CHBr-CH_2Br + 2NaNH_2 to CH_3C-=CH+2NaBr+2NH_3`
(ii)`CH_3C-=CH+NaNH_2 to CH_3C-=C^(-)Na^(+) + NH_3`
(iii)`CH_3C-=C^(-)Na^(+)+CH_3CH_2Br to CH_3C-=C CH_2CH_3 + NaBr`
It is evident that two moles of `NaNH_2` are required in eqn. (i) and one in eqn. (ii), therefore, overall, three moles of `NaNH_2` are required .
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