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In the series of n-alkanes, the melting ...

In the series of `n`-alkanes, the melting point of an unbranched alkane with an even number of `C` atoms is much…..than the previous unbranched alkane with an odd number of `C` atoms but slightly……than the succeeding unbranched alkane with an odd number of `C` atoms.

A

lower, lower

B

higher,higher

C

higher,lower

D

lower, higher

Text Solution

Verified by Experts

The correct Answer is:
C
Order of melting points
`{:("Pentane",lt,"Hexane",lt,"Heptane"),(143.3K,,178.5K,,182.K):}`
This is because alkanes chains with an even number of `C` atoms pack more closely in the crystalline state.
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