Ncert Exercises & Solutions

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

	Column I (Ions)		Column II (Corresponding nature)
A.		I.	Stable due to resonance
B.		II.	Destabilised due to inductive effect
C.		III.	Stabilised by hyperconjugation
D.		IV.	A secondary carbocation

Codes:

Options:	A	B	C	D
1.	I,II	II	II	III,IV
2.	I	II,IV	III	IV
3.	I	IV	III	II
4.	IV	I	III	II

Hint: Oxygen's negative charge is stabilized by resonance with carbon.

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.