Why does but-2-ene exhibit cis-trans isomerism?

1. Rotation around the C₂-C₃ double bond

2. Rotation around the C₃-C₄ sigma bond

3. Rotation around the C₁-C₂ bond

4. Restricted rotation around the C=C bond

The following two compounds (i) and (ii) are stereoisomers of each other. If compound (i) shows an optical rotation of +52°, the optical rotation of compound (ii) is:

1. -52°                2. +52°

3. 0°                   4. unpredictable

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.  Four (4)
2. Three (3)
3. Two  (2) 
4. One (1)

Find the total number of isomers possible for C₄H₈.