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Which of these has the lowest boiling po...

Which of these has the lowest boiling point?

A

`2`-Methylpentane

B

`3`-Methylpentane

C

`2,2`-Dimethylbutane

D

`2,3`-dimethylbutane

Text Solution

Verified by Experts

The correct Answer is:
C
With branching, the shape of the molecule tends to approach that of a sphere and as this happens, the surface area decreases. As a result, intermolecular forces become weaker and are overcome at a lower temperature. For equal number of branches, the more symmetrical the molecule, the higher the boiling point `(bp)`.
Order of bp:`underset(63^(@)C)((2)) gt underset(60^(@)C)((1)) gtunderset(58^(@)C)((4)) gt underset(50^(@)C)((3))`
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  • Which has the lowest boiling point?

    A
    `NH_(3)`
    B
    `PH_(3)`
    C
    `AsH_(3)`
    D
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  • Which noble gas has the lowest boiling point ?

    A
    He
    B
    Ne
    C
    Ar
    D
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  • Which one has the lowest boiling point ?

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    `H_2 O`
    B
    `H_2 S`
    C
    `H_2 Se`
    D
    `KNO_3`

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