Ncert Exercises & Solutions

Match the ions given in Column I with their nature-given in Column II.

Column I	Column II
A.	1. Stable due to resonance
B.	2. Destabilised due to inductive effect
C.	3. Stabilised by hyperconjugation.
D.	4. A secondary carbocation

Codes:

Options:	A	B	C	D
1.	1,2	2	2	3,4
2.	1	2,4	3	4
3.	1	4	3	2
4.	4	1	3	2

A. $\to$ (1,2) B. $\to$ (2) C. $\to$ (2) D. $\to$ (3,4)

Column I	Column II	Explanation
A.	Stable due to resonance Destabilised due to inductive effect
B. $F_{3} - C^{+}$	Destabilised due to inductive effect	-/effect of F creates electron deficiency at carbon C⁺
C.	Destabilised due to inductive effect	+/effect of CH₃ increases electron density at carbon C^-
D. ${CH}_{3} - \overset{\oplus}{C} H - {CH}_{3}$	A secondary carbocation stabilized due to hyperconjugation	$\overset{+}{C} H$ is attached to two carbon. It can also be stabilized by hyperconjugation.