Arrange the following compounds in increasing order of boiling point.
Propan-1-ol, butan-1-ol, butan-2-ol, pentan-1-ol
1. Propan-1-ol, butan-2-ol, butan-1-ol, pentan-1-ol
2. Propan-1-ol, butan-1-ol, pentan-1-ol ,butan-2-ol
3. Butan-2-ol,propan-1-ol, butan-1-ol, pentan-1-ol
4. Propan-1-ol, butan-1-ol, butan-2-ol, pentan-1-ol
Hint: As molecular mass of alcohol increases boiling point also increases.
Boiling point increases with 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 < butan-2-ol < butan-1-ol < pentan-1-ol.
Here, the cortect option is (1).
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