Question

Which of the following is incorrect order?

• A. $CH_{3}^{-}>CH_{3}O^{-}>HO^{-}>H_{2}O$ (Nucleophilicity in protic solvent)
• B. $Cl^{-}>CH_{3}COO^{-}>CH_{3}O^{-}>NH_{2}^{-}$ (Leaving group ability)
• C. Stability of alkane
• D. $CH_{3}-CH_{2}-F>CH_{3}-CH_{2}-Cl>CH_{3}-CH_{2}-Br>CH_{3}-CH_{2}-I\left(\right.Boilingpoint\left.\right)$

Answer 1

Answer: (D)

(i) nucleophilicity $ \propto $ negative charge density of at atom
(order of nuclophilicity) neutral atom
(ii) $Cl^{-}>CH_{3}COO^{-}>CH_{3}O^{-}>NH_{2}^{-}$ leaving group ability $ \propto \frac{1}{B a s i c \, s t r e n g t h}$
(iii) Stability of alkene $ \propto $ number of hyper conjugative structures