Question

Among the compounds:

$\mathrm { C } _ { 3 } \mathrm { H } _ { 7 } \mathrm { NH } _ { 2 } , \mathrm { CH } _ { 3 } \mathrm { NH } _ { 2 } \mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { NH } _ { 2 }$ nad $\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { NH } _ { 2 }$ which is the least basic compound?

• A. $\mathrm { CH } _ { 3 } \mathrm { NH } _ { 2 }$
• B. $\mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { NH } _ { 2 }$
• C. $\mathrm { C } _ { 3 } \mathrm { H } _ { 7 } \mathrm { NH } _ { 2 }$
• D. $\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { NH } _ { 2 }$

Answer 1

Answer: (D)

$\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { NH } _ { 2 }$

Answer 2

: Aryl amines are less basic than alkyl amines because phenyl group exerts –I effect resulting in decrease in electron density on nitrogen atom for protonation