Organic Chemistry – Some Basic Principles and Techniques · Question 9

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

Which of the following is correct with respect to -I effect of the substituents? (R = alkyl)

1. -NH2 < -OR < -F
2. -NR2 < -OR < -F
3. -NH2 > -OR > -F
4. -NR2 > -OR > -F

Which of the following carbocations is expected to be most stable?

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