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Arrange the following compounds in incre...

Arrange the following compounds in increasing order of boiling point :
Prpane-1-ol, butan-1-ol, butan-2-ol, pentan-1-ol

A

Propan-1-ol, butan-2-ol, butan-1-ol, pentan-1-ol

B

Propan-1-ol, butan-1-ol, butan-2-ol, pentan-1-ol

C

Propan-1-ol, butan-2-ol, butan-1-ol, pentan-1-ol

D

Propan-1-ol, butan-1-ol, butan-2-ol, pentan-1-ol

Text Solution

Verified by Experts

The correct Answer is:
A
Boiling point increase in the number of carbon atoms because of increase in molecular mass. So, the boiling point of pentan-1-ol is more than that of all other given compounds. Further, among isomeric alcohols, `1^(@)` alcohols have higher boiling points than `2^(@)` alcohols because of higher surface area in `1^(@)` alcohols. Therefore, boiling point increase in the order
`"Propan-1-ol " lt "butan-2-ol" lt "butan-1-ol" lt "pentan-1-ol"`.
Hence, the correct option is (a).
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