1. Tardigrade
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  3. Chemistry
  4. Which one of the following pairs gives effervescence with aq. NaHCO 3 ? underset(I)CH 3 COCl underset(II)CH 3 COCH 3 underset(III)CH 3 COOCH 3 underset(IV)CH 3 COOCOCH 3

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Q. Which one of the following pairs gives effervescence with aq. $NaHCO _{3} ?$
$\underset{(I)}{CH _{3} COCl}$
$\underset{(II)}{CH _{3} COCH _{3}}$
$\underset{(III)}{CH _{3} COOCH _{3}}$
$\underset{(IV)}{CH _{3} COOCOCH _{3}}$

WBJEEWBJEE 2008Aldehydes Ketones and Carboxylic Acids

Solution:

Due to strong negative inductive effect shown by $-Cl$ and $ -OCOCH_{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.
$CH_{3}-\overset{O}{{\overset{||}{{C}}}}-Cl\xrightarrow{NaHC{{O}_{3}}(aq)}C{{H}_{3}}-\overset{O}{{\overset{||}{{C}}}}-ONa +CO_{2}+HCl$
$ CH_{3}\overset{O}{{\overset{||}{{C}}}}-O-\overset{O}{{\overset{||}{{C}}}}CH_{3}\xrightarrow {NaHC{{O}_{3}}(aq)} 2CH_{3}-\overset{O}{{\overset{||}{{C}}}}-ONa +CO_{2}$