Question

The inductive effects of the group `-CH_(3),-COO^(-),-Br,-NH_(3)^(+)` respectively are
A. `+I,-I,+I,+I`
B. `-I,+I,-I,+I`
C. `-I,-I,+I,+I`
D. `+I,+I,-I,-I`

Answer 1

Correct Answer - D
Methyl group and carboxylate group `(-COO^(-))` both give electron donating `+I`-effect while `-Br` and `-NH_(3)^(+)` give electron withdrawing `-I`-effect.