Which of the following orders is true regarding the boiling point of organic substances?

Which of the following orders is true regarding the boiling point of organic substances?
  1. $\mathrm{CH}_{3} \mathrm{COCl}>\mathrm{CH}_{3} \mathrm{COOH}>\left(\mathrm{CH}_{3} \mathrm{CO}ight)_{2} \mathrm{O}$
  2. $\mathrm{CH}_{3} \mathrm{COCl} < \mathrm{CH}_{3} \mathrm{COOH} < \left(\mathrm{CH}_{3} \mathrm{CO}ight)_{2} \mathrm{O}$
  3. $\mathrm{CH}_{3} \mathrm{COCl}>\mathrm{CH}_{3} \mathrm{COOH} < \left(\mathrm{CH}_{3} \mathrm{CO}ight)_{2} \mathrm{O}$
  4. $\mathrm{CH}_{3} \mathrm{COCl} < \mathrm{CH}_{3} \mathrm{COOH}>\left(\mathrm{CH}_{3} \mathrm{CO}ight)_{2} \mathrm{O}$

Solution

$\mathrm{CH}_{3} \mathrm{COCl}$ does not involve hydrogen bonding. Its boiling point is lesser than $\mathrm{CH}_{3} \mathrm{COOH}$. The boiling point of the latter is lesser than that of $\left(\mathrm{CH}_{3} \mathrm{CO}ight)_{2} \mathrm{O}$ due to larger molar mass of $\left(\mathrm{CH}_{3} \mathrm{CO}ight)_{2} \mathrm{O}$. ~

Asked in: JEE-TOPICTESTS-CHEMISTRY

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