The maximum number of stereoisomers possible for 3-hydroxy-2-methyl butanoic acid is:

1. 1               2. 2

3. 3               4. 4

The enol form of acetone after treatment with D₂O gives:

1. $\mathrm{OD}$
$|$
${\mathrm{CH}}_3—\mathrm{C}={\mathrm{CH}}_2$

2. $\mathrm{O}$
$\left|\right|$
${\mathrm{CH}}_3—\mathrm{C}—{\mathrm{CD}}_3$

3. $\mathrm{OH}$
$|$
${\mathrm{CH}}_2=\mathrm{C}—{\mathrm{CH}}_2\mathrm{D}$

4. $\mathrm{OD}$
$|$
${\mathrm{CD}}_2=\mathrm{C}—{\mathrm{CD}}_3$

Maleic and fumaric acids are:

1. tautomers                 

2. geometrical isomers

3. chain isomers             

4. functional isomers

Isomers which can be interconverted through rotation around a single bond are:

1. Conformers             

2. Diastereomers

3. Enantiomers             

4. Positional isomers

How many structures of F are possible?

(1) 2

(2) 5

(3) 6

(4) 3

The optically active alkane with lowest molar mass is:

1. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{C}\equiv \mathrm{CH}$

2. ${\mathrm{CH}}_3{\mathrm{CH}}_2-\stackrel{{\mathrm{CH}}_3}{\stackrel{|}{\mathrm{CH}}}-{\mathrm{CH}}_3$

3. 

4. ${\mathrm{CH}}_3{\mathrm{CH}}_2.{\mathrm{CH}}_2{\mathrm{CH}}_3$

a-D-(+)-glucose and β-D-(+)-glucose are :

(1) enantiomers

(2) conformers

(3) epimers

(4) anomers

The absolute configuration of 

 is:

(1) S, R                 

(2) S, S

(3) R, R                 

(4) R, S

The correct statement regarding electrophile is

With respect to the conformers of ethane, which of the following statements is true?

(1) Bond angle remains same but bond length changes

(2) Bond angle changes but bond length remains same

(3) Both bond angle and bond length change

(4) Both bond angles and bond length remain same