The dihedral angle between two C-H bonds in the staggered conformation of ethane  is            

1. 60$°$ 

2. 180$°$

3. 0$°$ 

4. 120$°$

Isomers of a substance must have the same-         

1. Structure

2. Physical properties

3. Chemical properties

4. Molecular formula

But-2-ene exhibits cis-trans-isomerism due to

1. rotation around C₂-C₃ double bond

2. rotation around C₃-C₄ sigma bond

3. rotation around C₁-C₂ bond

4. restricted rotation around C=C bond

How many stereoisomers does this molecule have?           

CH₃CH=CHCH₂CHBrCH₃

1. 4       

2. 6       

3. 8       

4. 2

The general formula for cycloalkanes is:

1. C_nH_2n+2 

 2. C_nH_2n

3. C_nH_2n-2  

4. C_nH_2n+1

If optical rotation produced by the compound (i) is +52° then that produced by that the compound (ii) is:

1. -52°

2. +52°

3. 0°

4. unpredictable

Rotation of plane polarized light can be measured by:

1. manometer

2. calorimeter

3. polarimeter

4. viscometer

Which one of the following can exhibit cis-trans-isomerism?

1. CH₃-CHCl-COOH

2. H-C≡C-Cl

3. Cl-CH=CHCl

4. ClCH₂-CH₂Cl

Geometrical isomers differ in :

1. Position of functional group.

2. Position of atoms.

3. Length of carbon chain.

4. Spatial arrangement of atoms.

Fisher projection indicates:

1. horizontal substituents above the plane

2. vertical substituents above the plane

3. both horizontal and vertical substituents below the plane

4. both horizontal and vertical substituents above the plane