Identify X in the following sequence of react | vedclass

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(B) The reaction sequence involves the dehydrohalogenation of a vicinal dibromide using $NaNH_2$ to form an alkyne. The first step with $NaNH_2$ remov

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$CH_3-CH=C(H)-CH_2-CH_2-CH_3$ (trans-isomer)

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(B) The reaction sequence involves the dehydrohalogenation of a vicinal dibromide using $NaNH_2$ to form an alkyne. The first step with $NaNH_2$ removes two molecules of $HBr$ to produce $hex-2-yne$ $(CH_3-C \equiv C-CH_2-CH_2-CH_3)$.The second step involves the reduction of the alkyne using $Na$ in liquid $NH_3$ (Birch reduction),which stereoselectively reduces the internal alkyne to a $trans-alkene$.Therefore,the final product $X$ is $trans-hex-2-ene$.

Identify $X$ in the following sequence of reactions.
$CH_3-CH(Br)-CH(Br)-CH_2-CH_2-CH_3 \xrightarrow[(ii) Na \text{ in liquid } NH_3]{(i) NaNH_2} X$

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Identify $X$ in the following sequence of reactions.$CH_3-CH(Br)-CH(Br)-CH_2-CH_2-CH_3 \xrightarrow[(ii) Na \text{ in liquid } NH_3]{(i) NaNH_2} X$