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BITSAT 2016

Exam: BITSAT
Year: 2016
Subject: Chemistry
Chapter: Hydrocarbons

BITSAT 2016 · Chemistry · Hydrocarbons

CH_ 3 C CCH_ 3 H_ 2 / Pt A D_ 2 / Pt B The compounds A and B ,...

\quad \mathrm{CH}_{3} \mathrm{C} \equiv \mathrm{CCH}_{3} \stackrel{\mathrm{H}_{2} / \mathrm{Pt}}{\longrightarrow} \mathrm{A} \stackrel{\mathrm{D}_{2} / \mathrm{Pt}}{\longrightarrow} \mathrm{B}

The compounds

A

and

B

, respectively are

Options

Acis-butene-2 and $\mathrm{rac}-2,3$ -dideuterobutane
Btrans-butene-2 and $\mathrm{rac}-2$ , 3-dideuterobutane
Ccis-butene- 2 and meso-2, 3-dideuterobutane
Dtrans-butene-2 and meso-2, 3-dideuterobutane

Correct answer

C. cis-butene- 2 and meso-2, 3-dideuterobutane

Step-by-step solution

Catalytic hydrogenation of alkynes gives cis-alkene which in turn adds deuterium atoms in presence of

\mathrm{H}_{2}

again in

\mathrm{ci}

-manner forming meso -2,3 -dideuterobutane.

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