Which of the following is correct with respect to -|-effect of the substituents? (R = alkyl)

Options

A. `-NH_(2) gt -OR gt F`
B. `-NR_(2) lt -OR lt -F`
C. `-NH_(2) lt -OR lt -F`
D. `-NH_(2) gt -OR gt -F`

Answer

B, C

Explanation

I effect is related to the ability of substituent for the electron attraction capacity from the attached carbon atom.
i.e. it is based on electronegativity of an atom. This effect increases with increase in the electronegativity of an atom.
From above we can conclude that options (b) and (c ) are correct.
`-NR_(2) lt -OR lt -F` (-I effect)
`-NH_(2) lt - OR lt -F` (-I effect)
Also, options(a) and (d) shows the order of +I effect.
`-NH_(2) gt -OR gt -F` (+I effect)
`-NR_(2) gt -OR gt -F` (+ I effect)