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The decreasing order of boiling points i...

The decreasing order of boiling points is

A

n-pentane gt iso-pentane gt neo-pentane

B

Iso-pentane gt n-pentane gt neo-pentane

C

Neo-pentane gt iso-pentane gt n-pentane

D

n-pentane gt neo-pentane gt iso-pentane

Text Solution

Verified by Experts

The correct Answer is:
A
`underset(bp=36.1^@C)underset("Pentane")(CH_3CH_2CH_2CH_2CH_3)underset(bp-27.9^@C)underset("Isopentane")underset(CH_3)underset(|)(CH_3CH)CH_2CH_3underset(bp=9.5^@C)underset("Neopentane")underset(CH_3)underset(|)overset(CH_3)overset(|)(CH_3C CH_3)`
Boiling points of compounds with same molecular formula depend upon the surface area. More the branching, lesser the surface area hence boiling point decreases with branching.
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