A functional isomer of 1-butyne is:

2-butyne

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1-butene

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2-butene

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1,3-butadiene

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Solution

The correct option is B 1,3-butadiene
A functional isomer of 1-butyne is 1,3-butadiene.
Both have the same molecular formula $C_{4} H_{6}$ but differ in the nature of the functional group.
The functional group present in 1-butyne is $C \equiv C$ bond.
The functional group present in 1,3-butadiene is $C = C$ bond.

Thus, the correct option is $D$

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