Organic Chemistry – Some Basic Principles and Techniques

Consider the following compound (X) [figure] The most stable and least stable carbon radicals, respectively, produced by homolytic cleavage of corresponding C-H bond are :

1. III, II
2. II, IV
3. I, IV
4. II, I

Designate whether each of the following compounds is aromatic or not aromatic. [figure]

1. a, c, d, e, h aromatic and b, f, g not aromatic
2. b, e, f, g aromatic and a, c, d, h not aromatic
3. a, b, c, d aromatic and e, f, g, h not aromatic
4. e, g aromatic and a, b, c, d, f, h not aromatic

In 3,3-dimethylhex-1-en-4-yne, there are sp3, sp2 and sp hybridised carbon atoms respectively.

1. 4, 2, 2
2. 2, 4, 2
3. 3, 3, 2
4. 2, 2, 4

Match List - I with List - II. Choose the correct answer from the options given below :

1. (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
2. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
3. (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
4. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)

Total number of nucleophiles from the following is : NH3, PhSH, (H3C)2S, H2C=CH2, OH, H3O , (CH3)2 CO, [figure]

1. 4
2. 6
3. 5
4. 7

Total number of sigma ( ) and pi( ) bonds respectively present in hex-1-en-4-yne are:

1. 14 and 3
2. 11 and 3
3. 13 and 3
4. 3 and 13

The correct order of stability of following carbocations is : [figure]

1. A > B > C > D
2. C > B > A > D
3. B > C > A > D
4. C > A > B > D

Which one of the carbocations from the following is most stable?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

In the given structure, number of sp and sp2 hybridized carbon atoms present respectively are : [figure]

1. 3 and 5
2. 3 and 6
3. 4 and 5
4. 4 and 6

The hydrocarbon (X) with molar mass 80 g mol-1 and 90\% carbon has degree of unsaturation.