Tautomerism is exhibited by

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(D) Tautomerism requires the presence of at least one $\alpha$-hydrogen atom attached to a carbon atom adjacent to a functional group that can undergo

Vedclass · Accepted Answer

$RCH_2NO_2$

Vedclass · Answer

(D) Tautomerism requires the presence of at least one $\alpha$-hydrogen atom attached to a carbon atom adjacent to a functional group that can undergo tautomeric rearrangement.In the case of nitro compounds $(RCH_2NO_2)$,the $\alpha$-hydrogen atom is acidic and can migrate to the oxygen atom of the nitro group to form an aci-nitro form.The equilibrium is represented as:$R-CH_2-N^+(O)O^- \rightleftharpoons R-CH=N^+(OH)O^-$Since $(CH_3)_3CNO$,$(CH_3)_2NH$,and $R_3CNO_2$ lack an $\alpha$-hydrogen atom,they do not exhibit tautomerism.Therefore,the correct option is $D$.

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