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a
isobutane < Butane < Butene < Butyne
b
isobutane < Butane < Butyne < Butene
c
isobutane < Butyne < Butane < Butene
d
butyne < isobutane < Butane < Butene
answer is A.
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Detailed Solution
alkyne contains triple bond between the atom centers. Therefore, Alkynes are more polarizable which gives greater London dispersion forces, due to which they have higher Boiling points.