Q. The basicity of aniline is less than that of cyclohexylamine. This is due to
A) +R effect of – $NH_{2}$ group
B) -I effect of – $NH_{2}$ group
C) -R effect of –$NH_{2}$ group
D) Hyperconjugation effect
Explanation
(a)
$- NH_{2}$ has +R effect, it donates electrons to the benzene ring. As a result, the lone pair of electron on the N-atom gets delocalized over the benzene ring. As a result, the lone pair of electron on the N-atom gets delocalized over the benzene ring and thus it is less readily available for protonation. Hence, aniline is a weaker base than cyclohexylamine.
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.