Which of the following pairs are enantiomers?                

1. 

2. 

3. 

4. 

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

Which of the following has asymmetric carbon atom?

Stereoisomers (geometrical or opticals) which are neither superimposable nor mirror image to each other are called:

(1) enantiomers             

(2) mesomers

(3) tautomers               

(4) diastereomers

Diastereomers can be separated by:

(a) fractional distillation               (b) simple distillation

(c) electrophoresis                      (d) all of these

Which of the following pairs of carbon skeletons is an example of isomerism?

The number of isomeric structures for C₂H₇N would be:
1. 4
2. 3
3. 2 
4. 1

Number of isomers possible for C₄H₈ are _________

1. 4     

2. 3       

3. 2     

4. 6

The prefix name of -SH group in the IUPAC system is:

1. mercapto             
2. thiol
3. sulfide 
4. None of these

Which of the following will exhibit chirality?             

(1) 2-methyl hexane

(2) 3-methyl hexane

(3) Neopentane

(4) Isopentane