but-2-yne is reacted separately with one mole | vedclass

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(C, D) The reaction of $but-2-yne$ with $Na/liq. NH_3$ (Birch reduction) yields $trans-but-2-ene$ $(B)$.The reaction of $but-2-yne$ with $Pd/C$ (Lindl

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$B, C$ and $D$ only

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(C, D) The reaction of $but-2-yne$ with $Na/liq. NH_3$ (Birch reduction) yields $trans-but-2-ene$ $(B)$.The reaction of $but-2-yne$ with $Pd/C$ (Lindlar's catalyst) yields $cis-but-2-ene$ $(A)$.$A$ $(cis-but-2-ene)$ has a dipole moment $\mu 
eq 0$,while $B$ $(trans-but-2-ene)$ has $\mu = 0$.Statement $A$: $cis$ isomers are generally more polar and have higher boiling points,but solubility depends on crystal packing; $trans$ isomers $(B)$ pack better,leading to higher melting points.Statement $B$: $A$ $(cis)$ has a higher boiling point than $B$ $(trans)$,but $B$ has a higher melting point due to better symmetry.Statement $C$: $A$ is more polar than $B$ because $A$ has a non-zero dipole moment,while $B$ is zero. The statement claims $A$ is more polar because its dipole moment is zero,which is false.Statement $D$: Both $A$ and $B$ are alkenes and react similarly with $Br_2$; there is no significant difference in ease of addition. Thus,$D$ is also incorrect.Since $C$ and $D$ are incorrect,and no option matches,the question is flawed.

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