JEE Main Chemistry question
How many of the following nine compounds will have a higher boiling point than butan-2-ol? (I) a branched alkane-type structure (II) pentan-1-ol (III) a branched alcohol (IV) an ether (V) a branched hydrocarbon (VI) butan-1-ol (VII) hexan-1-ol (VIII) a ketone (IX) another branched structure.
Answer: 3
Solution
Boiling point among alcohols rises with molecular weight and falls with increasing branching; pentan-1-ol (II), butan-1-ol (VI), and hexan-1-ol (VII) are all straight-chain primary alcohols with equal or greater molecular weight and less
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