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Question:

2-hexyne gives trans-2-hexene on treatment with: Pt/H2, Li/NH3, Pd/BaSO4, LiAlH4

Li/NH3

LiAlH4

Pt/H2

Pd/BaSO4

Solution:

2-hexyne with Li/NH3 gives trans-2-hexene. This reaction is also considered as Birch reduction.