One mole of 1,2-dibromopropane on treatment w | vedclass

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(C) The reaction proceeds in two main stages:$1$. Dehydrohalogenation: $1,2$-dibromopropane $(CH_3-CH(Br)-CH_2Br)$ reacts with $2$ moles of $NaNH_2$ t

Vedclass · Accepted Answer

$3$

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(C) The reaction proceeds in two main stages:$1$. Dehydrohalogenation: $1,2$-dibromopropane $(CH_3-CH(Br)-CH_2Br)$ reacts with $2$ moles of $NaNH_2$ to undergo double dehydrohalogenation,forming propyne $(CH_3-C \equiv CH)$.$2$. Alkylation: The terminal alkyne (propyne) reacts with another $1$ mole of $NaNH_2$ to form the sodium acetylide intermediate $(CH_3-C \equiv C^-Na^+)$,which then reacts with ethyl bromide $(CH_3-CH_2Br)$ via an $S_N2$ mechanism to form pentyne $(CH_3-C \equiv C-CH_2-CH_3)$.Thus,the total number of moles of $NaNH_2$ required is $2 + 1 = 3$ moles. Therefore,$X = 3$.

One mole of $1,2$-dibromopropane on treatment with $X$ moles of $NaNH_2$ followed by treatment with ethyl bromide gave a pentyne. The value of $X$ is

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