(CH₃)₄N⁺ is neither an electrophile nor a nucleophile because it:

1. Does not have an electron pair for donation as well as cannot attract electron pair.

2. Neither has electron pair available for donation nor can accommodate electron since all shells of N are fully occupied.

3. Can act as Lewis acid and base.

4. None of the above.

Which of the following is an electrophilic reagent?

1. RO^-

2. BF₃

3. NH₃

4. RO····H

The-I effect is shown by:

1. -COOH

2. -CH₃

3. -CH₃CH₂

4. -CHR₂

Sulphur trioxide is:

1. an electrophile              2. a nucleophile

3. a homolytic agent          4. a base

Allyl isocyanide has:

1. 9σ and \(4\pi\) bonds.

2. 8σ and \(5\pi\) bonds.

3. 9σ, \(3\pi\) and 2 non-bonded electrons.

4.  8σ, \(3\pi\) and 4 non-bonded electrons.

The least stable resonance structure among the following is:

Hyperconjugation involves overlap of the following orbitals:

(1) σ - σ

(2) σ - p

(3) p - p

(4) π - π

Buta-1,3-diene and But-2-yne are:

1. position isomers

2. functional isomers

3. chain isomers

4. tautomers

In the following carbocations, the most stabile carbocation:

(1)  RCH₂C+H_{3         (2)} 

_{(3)                  (4)} 

The number of optical isomers of pent-3-en-2-ol is:

1. 2             
2. 4
3. 8             
4. 16