BITSAT2009ChemistryGeneral Organic ChemistryActual
The one which is least basic is
Options
- ANH ₃
- BC ₆ H ₅ NH ₂
- C( C ₆ H ₅ )₃ ~N
- D( C ₆ H ₅ )₂ NH
Correct answer
C. ( C ₆ H ₅ )₃ ~N
Step-by-step solution
More the electron density on N , higher will be the basicity. Density on N is influenced by the (i) nature of the group (+I or -I) present in alkyl group or benzene nucleus and (ii) resonance (delocalisation of the electron present on N ). In ( C ₆ H ₅ )₃ ~N : electron pair is delocalised to the maximum extent due to three benzene rings and hence least available for protonation, thus it will be least basic)