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a
isooctane
b
n-octane
c
2, 2, 3 - Trimethyl butane
d
n - butane
answer is B.
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Detailed Solution
→ As the number of carbons [molecular weight] increases,melting point and boiling point increases.→ As the branching decreases,surface area increases,Vander walls forces of attractions increases.Melting point and boiling points increases.