NEETChemistryGeneral Organic Chemistry
Match List-I with List-II. List-I (Carbocation) List-II (Number of hyperconjugative structures) (A) 1-Methylcyclopentyl cation (I) 4 (B) Cyclohexyl cation (II) 6 (C) 1-Ethylcyclohexyl cation (III) 7 (D) 2-Methylbutan-2-yl cation (IV) 8 Choose the correct answer from the options given below:
Options
- A(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
- B(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
- C(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
- D(A)-(II), (B)-(I), (C)-(III), (D)-(IV)
Correct answer
C. (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
Step-by-step solution
The number of hyperconjugative structures for an alkyl carbocation is equal to the number of -hydrogen atoms (hydrogen atoms attached to the sp^3 hybridized carbon atoms directly adjacent to the positively charged carbon). (A) 1-Methylcyclopentyl cation: The positively charged carbon is attached to a methyl group (3 -H) and two - CH ₂- groups of the cyclopentyl ring (2 + 2 = 4 -H). Total -H = 7. (B) Cyclohexyl cation: The positively charged carbon is attached to two - CH ₂- groups of the cyclohexyl ring (2 + 2 = 4