Which of the following pairs are enantiomers?                

1. 

2.  

3. 

4. 

In the following, the most stable conformation of n-butane is                

1.  

2.   

3.  

4. 

Select the correct option:-

1. resonating structures

2. tautomers

3. geometrical isomers

4. optical isomers

Which of the following compounds is not chiral ?

1. DCH2CH2CH2Cl

2. CH3CH2CHDCl

3. CH3CHDCH2Cl

4. CH3CHClCH2D

Which of the following is an optically active compound?        

1. 1-Butanol 

2. 1-Propanol

3. 2-Chlorobutane 

4. 4-Hydroxybutanal

A pair that represents chain isomer is:

1. CH₃CHCl₂ and ClCH₂CH₂Cl

2. Propyl alcohol and Isopropyl alcohol

3. 2-Methylbutane and Neopentane

4. Diethyl ether and Dipropylether

Number of monochlorinated products (excluding stereo-isomers) obtained from the given reaction are :

How many structural isomers are possible for the compound having molecular formula C₃H₅Br₃?

1. 5                   

2. 4

3. 6                   

4. 8

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