Which of the following used for the conversion of $2 - h e x y n e$ into $2 - h e x e n e$ ?

H_{2} / P d / B a S O_{4}

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H_{2}, P t O_{2}

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N a B H_{4}

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L i - N H_{3} / C_{2} H_{5} O H

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Solution

The correct option is B $L i - N H_{3} / C_{2} H_{5} O H$
The parial reduction of alkynes by active metal in liquid ammonia takes place through trans vinylic anion which ultimately produces trans alkene. 2-hexyne gives trans-2-hexene on treatment $L i - N H_{3} / C_{2} H_{5} O H$

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N a - C_{2} H_{5} O H

N a {B H}_{4}

H_{2} / p d - B a {S O}_{4}

L i A I H {({C H e}_{3})}_{3}

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