Maximum enol content is in 

1. 

2.

3.

 

4. 

Meso tartaric acid is optically inactive due to the presence of:

1. Molecular symmetry

2. Molecular asymmetry

3. External compensation

4. Two asymmetric carbon atoms

 The molecular formula of diphenyl methane

 is  C₁₃H₁₂

How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom?

1. 6        2. 4       3. 8        4. 7

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-