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

Geometrical isomerism is caused:

1. by restricted rotation around C=C bond

2. by the presence of one asymmetric carbon atom

3. due to the different groups attached to the same functional group

4. by swing of hydrogen atom between two polyvalent atoms.

Which of the following is optically active?

(1) Alanine

(2) 2-butanol

(3) Lactic acid

(4) All of these

Benzaldoxime exists in how many forms?

1. 1

2. 2

3. 3

4. 4

Nitroethane can exhibit one of the following kind of isomerism:

1. metamerism              2. optical activity

3. tautomerism              4. position isomerism

Which type of strain is present in fully eclipsed conformation of butane?

(1) Angle strain            

(2) Steric strain

(3) Both (a) and (b)         

(4) Neither (a) and (b)