Which of the structures A to D is 4,4-dimethylpent-2-yne? (The compound shown is a different constitutional isomer of the same formula, given for comparison only.)

AStructure A
BStructure B
CStructure C
DStructure D

Answer: C

4,4-Dimethylpent-2-yne has a CH3-C#C- unit followed by a carbon carrying two methyls and one methyl as chain end: CH3-C#C-C(CH3)2-CH3, which is Structure C. Structure A is 4,4-dimethylpent-1-yne, B is 3,3-dimethylpent-1-yne and D is 4-methylhex-2-yne.

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