# 12.9     Which of the two: $O_{2}NCH_{2}CH_{2}O^{-}$ or $CH_{2}CH_{2}O^{-}$is expected to be more stable and why ?

Since Nitro group is an electron withdrawing group. So, it shows $-I$ effect, By reducing the electron negative charge of the compound, it stabilises the compound. On the other hand, the methyl group is an electron donor group so it shows $+I$ effect. This increases the negative charge on the compound and destabilises the compound.

Hence  $O_{2}NCH_{2}CH_{2}O^{-}$  is more stable than the $CH_{2}CH_{2}O^{-}$.

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