Organic Chemistry – Some Basic Principles and Techniques

Methyl group attached to a positively charged carbon atom stabilizes the carbocation due to

1. -I inductive effect
2. electromeric effect
3. hyperconjugation
4. mesomeric effect

The number of bonds, bonds and lone pair of electrons in pyridine, respectively are:

1. 12, 3, 0
2. 11, 3, 1
3. 12, 2, 1
4. 11, 2, 0

Consider the following compounds/species: [figure] The number of compounds/species which obey Hückel's rule is .

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

Which compound amongst the following is not an aromatic compound?

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

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

1. 1-bromo-5-chloro-4-methylhexan-3-ol
2. 6-bromo-2-chloro-4-methylhexan-4-ol
3. 1-bromo-4-methyl-5-chlorohexan-3-ol
4. 6-bromo-4-methyl-2-chlorohexan-4-ol

What is the hybridization shown by C1 and C2 carbons, respectively in the given compound? OHC- 1CH=CH- 2CH2COOCH3

1. sp3 and sp3
2. sp2 and sp3
3. sp2 and sp2
4. sp3 and sp2

Which of the following is the most stable carbocation?

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

The correct structure of 2, 6-dimethyl-dec-4-ene is

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

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?

1. +R effect of -CH3 groups
2. -R effect of -CH3 groups
3. Hyperconjugation
4. -I effect of -CH3 groups

The number of sigma ( ) and pi ( ) bonds in pent-3-en-1-yne is -

1. 11 bonds and 2 bonds
2. 13 bonds and no bonds
3. 10 bonds and 3 bonds
4. 8 bonds and 5 bonds