Question

Which of the following pair gives effervescence with $NaHC{O}_3$?
$\underset{\left(I\right)}{{CH}_{3}COCl}$
$\underset{\left(II\right)}{{CH}_{3}COC{H}_3}$
$\underset{\left(III\right)}{{CH}_{3}COO{CH}_3}$
$\underset{\left(IV\right)}{{CH}_{3}COOCO{CH}_3}$

• A. I and II
• B. I and IV
• C. II and III
• D. I and III

Answer 1

The correct option is B I and IV

Due to strong negative inductive effect shown by $-Cl$ and $-OCO{CH}_3$ group, acid chloride and acid anhydride are highly reactive among acid derivatives. They react independently with water even in the absence of catalyst to give carboxylic acid.

${CH}_3-\stackrel{\stackrel{O}{\parallel }}{C}-Cl\stackrel{NaH{CO}_3\left(aq\right)}{\to }{CH}_3-\stackrel{\stackrel{O}{\parallel }}{C}-ONa+{CO}_2+HCl$

${CH}_3-\stackrel{\stackrel{O}{\parallel }}{C}-O-\stackrel{\stackrel{O}{\parallel }}{C}{CH}_3\stackrel{NaH{CO}_3\left(aq\right)}{\to }{2CH}_3-\stackrel{\stackrel{O}{\parallel }}{C}-ONa+{CO}_2$