Convert Ethyne to But-2-yne.

Conversion of Ethyne to But-2-yne:

a) 
HCCH + Na liq. NH3 NaCCNa 2 CH3I CH3CCCH3



b) HCCH H2, nickel CH3CH3 Cl2, sunlight CH3CH2Cl Na, ether CH3CH2CH2CH3 Br2, sunlight CH3CH2CHBrCHAlcoholic KOH CH3CH=CHCH3 ​Br2, CCl4 CH3CHBrCHBrCH2 Alcoholic KOH CH3CCCH3

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