Organic Chemistry – Some Basic Principles and Techniques · Question 12

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]

Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms?

1. HC C - C CH
2. CH2 = CH - C CH
3. CH2 = CH - CH = CH2
4. CH3 - CH = CH - CH3

The correct statement regarding electrophile is

1. electrophile is a negatively charged species and form a bond by accepting a pair of electrons from another electrophile
2. electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile
3. electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile
4. electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile.

The IUPAC name of the compound [figure]

1. 5-formylhex-2-en-3-one
2. 5-methyl-4-oxohex-2-en-5-al
3. 3-keto-2-methylhex-5-enal
4. 3-keto-2-methylhex-4-enal