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Question

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

A
H2,Pd/C/CaCO3
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B
H2,Pt
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C
NaBH4
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D
Na/liq NH3
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Solution

The correct option is D Na/liq NH3
H2,Pd/C/BaSO4 which is also known as lindlar's catalyst reduces an alkyne to cis-alkene. H2/Pt reduces it to alkane. NaBH4 does not reduce an alkyne. Reduction of an alkyne by active metal in liq. NH3 gives trans-alkene. This is known as birch reduction. Hence, the correct answer is option (d).

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