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(A) The reaction sequence is as follows:$1$. The terminal alkyne $Ph-C \equiv CH$ reacts with $NaNH_2$ in $NH_3$ to form the acetylide ion $Ph-C \equi

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$Ph-CH=CH-CH_3$ (cis-isomer)

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(A) The reaction sequence is as follows:$1$. The terminal alkyne $Ph-C \equiv CH$ reacts with $NaNH_2$ in $NH_3$ to form the acetylide ion $Ph-C \equiv C^- Na^+$.$2$. This nucleophilic acetylide ion undergoes an $S_N2$ reaction with $CH_3I$ to form the substituted alkyne $Ph-C \equiv C-CH_3$.$3$. The catalytic hydrogenation of the internal alkyne $Ph-C \equiv C-CH_3$ using $H_2$ and $Pd/C$ (Lindlar's catalyst is not specified,but $Pd/C$ typically reduces alkynes to alkenes) results in the formation of the cis-alkene,$Ph-CH=CH-CH_3$.

The final major product obtained in the following sequence of reaction is

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