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Earlier discussion
1 older comment kept for context.
John Kenny Ade
The straight chain members like akane akanol . show a steady increase in boiling point as the molecular mass increases
Hence propanol C3H7OH have boiling point of 98 also heptane which has a boiling point of 98 and butane which have boiling point of 1
Therefore propanol have molecular mass of 60 while. Heptane have molecular mass of 100
And butane have molecular mass of 58
Therefore increasing value is, butane, propanol , heptane
Therefore the answer is D