Organic Chemistry – Some Basic Principles and Techniques

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below

1. Statement I is false but Statement II is true
2. Statement I is true but Statement II is false
3. Both Statement I and Statement II are false
4. Both Statement I and Statement II are true

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.

The correct stability order of the following species/molecules is : [figure]

1. q > r > p
2. q > p > r
3. p > q > r
4. r > q > p

The IUPAC name of the following compound is : [figure]

1. 5-Methoxycarbonyl-2-methylhexanoic acid
2. Methyl-5-carboxy-2-methylhexanoate.
3. 2-Carboxy-5-methoxycarbonylhexane.
4. Methyl-6-carboxy-2,5-dimethylhexanoate.

The most stable carbocation from the following is :

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

The alkane from below having two secondary hydrogens is :

1. 2,2,4,5-Tetramethylheptane
2. 2,2,4,4-Tetramethylhexane
3. 4-Ethyl-3,4-dimethyloctane
4. 2,2,3,3-Tetramethylpentane

Relative stability of the contributing structures is : [figure]

1. (II) > (I) > (III)
2. (III) > (II) > (I)
3. (I) > (III) > (II)
4. (I) > (II) > (III)

Correct order of basic strength of Pyrrole, Pyridine and Piperidine is : [figure]

1. Pyridine > Piperidine > Pyrrole
2. Pyrrole > Piperidine > Pyridine
3. Pyrrole > Pyridine > Piperidine
4. Piperidine > Pyridine > Pyrrole

How many compounds among the following compounds show inductive, mesomeric as well as hyperconjugation effects? [figure]

The correct stability order of the following resonance structures of CH3-CH=CH-CHO is [figure]

1. II > III > I
2. II > I > III
3. III > II > I
4. I > II > III

Which of the following are aromatic?

1. B and D only
2. A and C only
3. C and D only
4. A and B only

In the given compound, the number of 2° carbon atom/s is . [figure]

1. Two
2. Three
3. Four
4. One

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below:

1. Both Statement I and Statement II are incorrect.
2. Both Statement I and Statement II are correct.
3. Statement I is correct but Statement II is incorrect.
4. Statement I is incorrect but Statement II is correct.

The shape of carbocation is :

1. tetrahedral
2. diagonal pyramidal
3. diagonal
4. trigonal planar

IUPAC name of following hydrocarbon(X) is : CH3- CH3 |CH-CH2- (X)CH2- CH3 |CH- CH3 |CH-CH2-CH3

1. 2,5,6-Trimethyloctane
2. 2-Ethyl-2,6-diethylheptane
3. 3,4,7-Trimethyloctane
4. 2-Ethyl-3,6-dimethylheptane

Total number of aromatic compounds among the following compounds is . [figure]

Functional group present in sulphonic acids is :

1. -SO2
2. [figure]
3. -SO3H
4. -SO4H

[figure] The correct arrangement for decreasing order of electrophilic substitution for above compounds is :

1. (III) > (IV) > (II) > (I)
2. (III) > (I) > (II) > (IV)
3. (II) > (IV) > (III) > (I)
4. (IV) > (I) > (II) > (III)

Number of carbocations from the following that are not stabilized by hyperconjugation is . [figure]

Number of and bonds present in ethylene molecule is respectively :

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

The correct nomenclature for the following compound is : [figure]

1. 2-carboxy-4-hydroxyhept-7-enal
2. 2-formyl-4-hydroxyhept-7-enoic acid
3. 2-carboxy-4-hydroxyhept-6-enal
4. 2-formyl-4-hydroxyhept-6-enoic acid