Question

Among the following the weakest base is

• A. $\mathrm { CH } _ { 3 } \mathrm { NHCHO }$
• B. $\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CH } _ { 2 } \mathrm { NH } _ { 2 }$
• C. $\mathrm { NO } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { NH } _ { 2 }$
• D. $\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CH } _ { 2 } \mathrm { NHCH } _ { 3 }$

Answer 1

Answer: (A)

$\mathrm { CH } _ { 3 } \mathrm { NHCHO }$

Answer 2

: A strong electron withdrawing group directly attached to amino group withdraws electron towards resonance.