The basicity of compounds I, II, III and IV $\mathop {{\rm{C}}{{\rm{H}}_3}{\rm{N}}{{\rm{H}}_2}}\limits_{\rm{I}} ,\,\,\,\mathop {{{\left( {{\rm{C}}{{\rm{H}}_3}} \right)}_2}{\rm{NH}}}\limits_{{\rm{II}}} ,{\rm{\;}}\,\,\mathop {{{\left( {{\rm{C}}{{\rm{H}}_3}} \right)}_3}{\rm{N}}}\limits_{{\rm{III}}} ,{\rm{\;}}\mathop {{{\rm{C}}_6}{{\rm{H}}_5}{\rm{C}}{{\rm{H}}_2}{\rm{N}}{{\rm{H}}_2}}\limits_{{\rm{IV}}} $ varies in the order

JEE CHEMISTRY MCQ: AMINES

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The basicity of compounds I, II, III and IV

\mathop {\mathrm{C}{\mathrm{H}_3}\mathrm{N}{\mathrm{H}_2}}\limits_\mathrm{I} ,\,\,\,\mathop {{{\left( {\mathrm{C}{\mathrm{H}_3}} \right)}_2}\mathrm{NH}}\limits_{\mathrm{II}} ,\mathrm{\;}\,\,\mathop {{{\left( {\mathrm{C}{\mathrm{H}_3}} \right)}_3}\mathrm{N}}\limits_{\mathrm{III}} ,\mathrm{\;}\mathop {{\mathrm{C}_6}{\mathrm{H}_5}\mathrm{C}{\mathrm{H}_2}\mathrm{N}{\mathrm{H}_2}}\limits_{\mathrm{IV}}

varies in the order

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Correct option: B

II > I > III > IV

Option B is correct because the basicity order is II > I > III > IV due to the combined effects of +I effect, steric hindrance, and the electron-withdrawing nature of the phenyl group.

JEE CHEMISTRY MCQ: AMINES

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