Question

Arrange the following in the their increasing order of boiling points CH3CHO, CH3COOH, CH3CH2OH ?

Answer 1

the correct one is your reverse order of your question order

Answer 2

Explanation:

The boiling point of alcohol, carboxylic acid and aldehyde can be known by the hydrogen bonding within these compounds.

There are greater hydrogen bonding interactions between the carboxylic acid compound(s). Therefore, in order to break this hydrogen bonding this temperature is required. As a result, the boiling point will increase.

The hydrogen bonding in aldehydes is less strong as compared to carboxylic acids but they have greater hydrogen bonding than alcohols. Therefore, boiling point of aldehydes is more than the boiling point of alcohols but less than carboxylic acids.

Whereas hydrogen bonding in alcohols is weakest as compared to carboxylic acids and aldehydes. Thus, alcohols will have low boiling point.

Therefore, the increasing order of boiling points is as follows.

 $CH_{3}CH_{2}OH$ < $CH_{3}CHO$ < $CH_{3}COOH$