Organic Chemistry Basics 2 Question 3
3. The increasing order of nucleophilicity of the following nucleophiles is
(2019 Main, 10 April II) (1) $\mathrm{CH}{3} \mathrm{CO}{2}^{\ominus}$ (2) $\mathrm{H}{2} \mathrm{O}$ (3) $\mathrm{CH}{3} \mathrm{SO}_{3}^{\ominus}$ (4) $\stackrel{\ominus}{\mathrm{O}} \mathrm{H}$
(a) (1) $<$ (4) $<$ (3) $<$ (2)
(b) (2) $<$ (3) $<$ (1) $<$ (4)
(c) (4) $<$ (1) $<$ (3) $<$ (2)
(d) (2) $<$ (3) $<$ (4) $<$ (1)
Show Answer
Answer:
Correct Answer: 3. (c)
Solution:
- Higher the basicity of a base, stronger will be its nucleophilic power.
Again we know, a weaker acid produces a stronger base (conjugate), i.e. a stronger nucleophile.
Thus, the correct order of nucleophilicity of given nucleophiles are as follows :
$$ \mathrm{H}{2} \mathrm{O}(2)<\mathrm{CH}{3} \mathrm{SO}{3}^{-}(3)<\mathrm{CH}{3} \mathrm{CO}_{2}^{-}(1)<\overline{\mathrm{O}} \mathrm{H}(4) $$
