The IUPAC name of  is:

1. Butane-2, 3-dial

2. Butane-1, 3-dione

3. Butane-2, 3-dione

4. 1, 2-dimethylethanedione

The IUPAC name of  is:

1. 4-Bromo benzenamine

2. 4-Amino-1-bromobenzene

3. 4-Bromo benzenamide

4. 1-Bromo benzencarboxamide

The IUPAC name of  is:

1. 2, 6-Dimethylhepta-2, 5-dienoic acid

2. 3, 7-Dimethylhepta-2, 5-dienoic acid

3. 1-Hydroxy-2, 6-dimethylhepta-2, 5-dienone

4. none of these

The most stable carbocation is:

1. 

2. 

3. 

4. 

The electromeric effect in organic compounds is a

1. temporary effect

2. permanent effect

3. temporary-permanent effect

4. none of the above

The stability of 2,3-dimethyl but-2-ene is more than 2-butene. This can be explained in terms of:

1. Resonance

2. Hyperconjugation

3. Electromeric effect

4. Inductive effect

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

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