$2 - h e p t y n e \to c i s - 2 - h e p t a n e$
Choose the best reagent for the above transformation:

H_{2} / P t

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N a / l i q . N H_{3}

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H^{+} / H_{2} O

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H_{2}

/Lindlar's catalyst

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Solution

The correct option is C $H_{2}$ /Lindlar's catalyst
Lindlar catalyst is used for the cis- hydrogenation of an alkyne to an alkene. Lindlar catalyst is a heterogeneous catalyst that consists of palladium deposited on calcium carbonate which is then poisoned with various forms of lead or sulphur.
Here Lindlar catalyst/ $H_{2}$ is used for the conversion of 2-heptyne to cis-2-heptene.

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$B Y \leftarrow 2 - B u t y n e + H_{2} X - \to A .$ A and B are geometrical isomers, A is more symmetrical than B. Then X and Y are

C_{2} H_{2} \to

R e a g e n t s

N a N H_{2}

H_{2} / P t

H_{2}

X

N a / l i q . N H_{3}

Y

X

Y

Y

X

C_{6} H_{11} - C \equiv C - C H_{3} R ⟶ cis-alkene

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