Which of the following acid does not exhibit optical isomerism?

1. Maleic acid                             

2. $\mathrm{\alpha }$-amino acid

3. Lactic acid                             

4. Tartaric acid                             

Number of isomers possible for C₄H₈ are _________

1. 4     

2. 3       

3. 2     

4. 6

The number of possible isomers of the aromatic compound with molecular formula C₇H₈O is:        

1. 3             

2. 5

3. 7             

4. 9

Tautomerism will be exhibited by                 

1. (CH₃)₃CNO               2. (CH₃)₂NH

3. R₃CNO₂                    4. RCH₂NO₂

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

1. 5                    2. 4

3. 6                    4. 8

Which of the following pairs are enantiomers?                

1. 

2. 

3. 

4. 

The pair that represents chain isomers is- 

Mark the correct option concerning the below-given structures:

​      

1. Resonating structures

2. Tautomers

3. Geometrical isomers

4. Optical isomers

Fischer 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.

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