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Question
2-butyne and 1,3-butadiene exhibit?
Options:
A .  Metamerism
B .  Functional isomerism
C .  Position isomerism
D .  Tautomerism
Answer: Option B
:
B
CH3CCCH3 is 2-butyne and CH2=CHCH=CH2 is 1,3-butadiene.
As their molecular formula is the same but functional group is different they are functional isomers.
2-butyne has a triple bond while 1,3-butadiene has two double bonds.

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