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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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Knowledge Check

  • The IUPAC name of unbranched alkane with 20 C atoms is

    A
    hectane
    B
    icosane
    C
    triacontane
    D
    hentriacontane

  • An alkane with even number of carbon only, can result in :

    A
    Sagatier senderens reaction
    B
    Wurtz reaction
    C
    Kolbe's electrolytic reaction
    D
    Grignard reaction

  • An alkane forms isomers if the number of carbon atoms is

    A
    `ge1`
    B
    `ge2`
    C
    `ge3`
    D
    `ge4`

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