Which of the following compounds has the highest boiling point ?

C_{2} H_{5} O H

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C H_{3} C O O H

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C H_{3} C O C H_{3}

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H C O O C H_{3}

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Solution

The correct option is B $C H_{3} C O O H$
Carboxylic acids have higher boiling points than aldehydes, ketones, and given alcohol of comparable molecular mass. This is because of formation of stronger intermolecular H-bonding than alcohol. Hence, the correct answer is option (b).

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