The alkyne shown is reduced by different methods. Select ALL correct statements.

ANa in liquid $NH X_{3}$ gives the E alkene.
B $H X_{2}$ over Lindlar catalyst gives the E alkene.
CThe products from Na/ $NH X_{3}$ and from Lindlar reduction are diastereomers (geometric isomers) of each other.
DComplete hydrogenation with $H X_{2}$ , Pd/C gives pentane.

Answer: A, C, D

The compound is pent-2-yne. Na/

NH X_{3}

gives (E)-pent-2-ene (statement 1 true); Lindlar gives the Z alkene, so statement 2 is false. E and Z isomers are geometric diastereomers (true), and exhaustive hydrogenation yields pentane (true).

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The alkyne shown is reduced by different methods. Select ALL correct statements.

Answer: A, C, D

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