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JEE Advanced levelSingle correct optionDifficulty 3 of 3ro036

Hex-3-yne is reduced with Na in liquid $NH X_{3}$ and the product is treated with $Br X_{2}$ in $CCl X_{4}$ (anti addition). The final product is

Aracemic (3R,4R)- and (3S,4S)-3,4-dibromohexane
Bmeso-3,4-dibromohexane
C3,3,4,4-tetrabromohexane
D(Z)-3,4-dibromohex-3-ene

Answer: B

Na/

NH X_{3}

gives (E)-hex-3-ene. Anti addition of

Br X_{2}

to an E-alkene gives the meso dibromide.

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