Which of the following is used for the conversion of 2- hexyne into trans-2- hexene?

H_{2}, P d / C / C a C O_{3}

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H_{2}, P t

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N a B H_{4}

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N a / l i q N H_{3}

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Solution

The correct option is D $N a / l i q N H_{3}$
$H_{2}, P d / C / B a S O_{4}$ which is also known as lindlar's catalyst reduces an alkyne to cis-alkene. $H_{2} / P t$ reduces it to alkane. $N a B H_{4}$ does not reduce an alkyne. Reduction of an alkyne by active metal in liq. $N H_{3}$ gives trans-alkene. This is known as birch reduction. Hence, the correct answer is option (d).

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