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Arrange the following in decreasing orde...

Arrange the following in decreasing order of their boiling points.
(A) n-butane
(B) 2-methylbutane
(C) n-pentane
(D) 2,2-dimethylpropane

A

`AgtBgtCgtD`

B

`BgtCgtDgtA`

C

`DgtCgtBgtA`

D

`CgtBgtDgtA`

Text Solution

Verified by Experts

The correct Answer is:
D
As the number of carbon atom increases, boiling point increases. Boiling point decreases with branching.
2,2-Dimethyl propane,- `underset(("b.pt=282.5"))(H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3))`
n-pentane- `underset((b.pt=309.1K))(H_(3)C-CH_(2)-CH_(2)-CH_(2)-CH_(3))`
2-methyl butane- `underset((b.pt=301K))(H_(3)C-H_(2)C-Hunderset(CH_(3))underset(|)(C)-CH_(3))`
n-butane- `underset(("4 carbon atoms with no braching"))underset((b.pt=273K))(H_(3)C-H_(2)C-CH_(2)-CH_(3))`
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Knowledge Check

  • Arrange the following in decreasing order of their boiling points: (I) n-Butane (II) 2-Methylbutane, (III) n-Pentane (IV) 2,2-Dimethylpropane

    A
    IgtIIgtIIIgtIV
    B
    IIgtIIIgtIVgtI
    C
    IVgtIIIgtIIgtI
    D
    IIIgtIIgtIVgtI

  • Arrange the following in decreasing order of their boiling points . (A ) n- butane (B) 2 - methybultane (C ) n - petane (D ) 2 , 2 - dimethylpropane

    A
    `A gt B gt C gt D `
    B
    `B gt C gt D gt A `
    C
    `D gt C gt B gt A `
    D
    `C gt B gt D gt A `

  • Arrange the following in the decreasing order of their boiling points: I.

    A
    (a) `(I) gt (III) gt (II) gt (IV)`
    B
    (b) `(I) gt (II) gt (III) gt (IV)`
    C
    (c) `(III) gt (IV) gt (II) gt (I)`
    D
    (d) `(IV) gt (III) gt (II) gt (I)`

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