Question

Arrange the anions $\left(p\right)\overset{-}{C}H_{3},\left(q\right)\overset{-}{N}H_{2},\left(r\right)OH^{-}, \, \left(s\right)F^{-}$ in decreasing order of their basic strength

• A. p > q > r > s
• B. q > p > r > s
• C. r > q > p > s
• D. r > p > q > s

Answer 1

Answer: (A)

$Strength$ $of$ $conjugate$ $base \propto \frac{1}{A c i d i c \, s t r e n g t h}$
As acidic strength is $CH_{4} < NH_{3} < H_{2}O < HF$
So conjugate base strength is $CH_{3}^{-}>NH_{2}^{-}>OH^{-}>F^{-}$