The reaction sequence is: Br-(CH_2)_{12}-Cequ | vedclass

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(B) $1$. The terminal alkyne $Br-(CH_2)_{12}-C\equiv CH$ reacts with $NaNH_2$ to form an acetylide ion,which then undergoes intramolecular nucleophili

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$A$ cyclic alkene with a cis-double bond.

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(B) $1$. The terminal alkyne $Br-(CH_2)_{12}-C\equiv CH$ reacts with $NaNH_2$ to form an acetylide ion,which then undergoes intramolecular nucleophilic substitution to form a cyclic alkyne $(A)$.$2$. The partial hydrogenation of the cyclic alkyne $(A)$ using $Lindlar$ catalyst ($Pd/CaCO_3$ poisoned with $PbO$ or quinoline) specifically yields the $cis$-alkene $(B)$.

The reaction sequence is: $Br-(CH_2)_{12}-C\equiv CH$ $\xrightarrow{NaNH_2} (A)$ $\xrightarrow[Catalyst]{Lindlar} (B)$. The product $(B)$ is:

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