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(B) The reaction proceeds in two steps:$1$. The reduction of but-$2$-yne $(CH_3-C \equiv C-CH_3)$ with $Na/liq. NH_3$ (Birch reduction) gives trans-bu

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$2$

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(B) The reaction proceeds in two steps:$1$. The reduction of but-$2$-yne $(CH_3-C \equiv C-CH_3)$ with $Na/liq. NH_3$ (Birch reduction) gives trans-but-$2$-ene $(CH_3-CH=CH-CH_3)$.$2$. The subsequent reaction with cold dilute alkaline $KMnO_4$ (Baeyer's reagent) performs syn-hydroxylation of the alkene to form butane-$2,3$-diol $(CH_3-CH(OH)-CH(OH)-CH_3)$.$3$. The product $P$ is butane-$2,3$-diol,which contains $2$ oxygen atoms.

The major product of the following reaction is $P$. Number of oxygen atoms present in product $P$ is $. . . . . . . . . . . (nearest integer)$.

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In the reaction
$R - C \equiv C - R \xrightarrow{Pd + CaCO_3} B$
$R - C \equiv C - R \xrightarrow{Na + liq. NH_3} A$
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Carbon-carbon bond length is minimum in

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Reactant $P$ (an alkyne) gives products $Q$ (trans-alkene) or $R$ (cis-alkene).
The possible reagents are:
$(I) \ 2Na/liq. NH_3$
$(II) \ H_2/Pd/CaCO_3$ (quinoline)
$(III) \ 2H_2/Pd/C$
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$1$-Alkyne and $2$-alkyne can be distinguished by

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