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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

`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`

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, n-pentane, n-2-methyl butane n-butane"),(" "CH_(3)),(" |"),(H_(3)C-C-CH_(3)" "H_(3)C-CH_(2)-CH_(2)-CH_(2)-CH_(3)" "H_(3)C-H_(2)C-HC-CH_(3)" "H_(3)C-H_(2)C-CH_(2)-CH_(3)),(" | " b.pt=309.1k """ |" " "b.pt273 K),(" "CH_(3) " "CH_(3)),(b.pt=282.5 K" "b.pt = 301 K " (4 carbon atoms with no branching)"):}`
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