Which of the following is correct with respect to `-I` effect of the substitutes? `(R=alkyl)`

Options

A. `-NR_(2) larrOR larr F`
B. `-NR_(2) gt -OR lt -F`
C. `-NR_(2) lt -F lt -OR`
D. `-NR_(2) gt -ORgt - F`

Answer

A

Explanation

The magnitude of `-I` effect is directly related to the electronegativity of the atom bonded to `C`.
Since the order of electronegativity is `N lt O ltF`, the correct order of `-I` effect is `-NR_(2) lt OR lt -F`