Answer:
\[{{O}_{2}}NC{{H}_{2}}C{{H}_{2}}{{O}^{-}}\] is more stable because\[-N{{O}_{2}}\] group has \[-l\] effect\[({{O}_{2}}N-\leftarrow
C{{H}_{2}}-\leftarrow C{{H}_{2}}-\leftarrow {{O}^{-}})\]and hence it disperses
the \[-ve\]charge on the O-atom. On the other hand \[C{{H}_{3}}C{{H}_{2}}-\]
group has \[+I\] effect and hence increases the negative charge on the O-atom
and thus destabilizes it.
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