A molecule, among the following, capable of showing tautomerism is:  

1.  ${\mathrm{R}}_3{\mathrm{CNO}}_2$

2.  ${\mathrm{RCH}}_2{\mathrm{NO}}_2$

3.  ${\left(C{H}_3\right)}_{2}NH$

4.  ${\left(C{H}_3\right)}_{3}CNO$

(+)-mandelic acid has a specific rotation of $+158°$. What would be the observed specific rotation of a mixture containing 25% (-)-mandelic acid and 75% (+)-mandelic acid?

1.  +79$°$

2.  -118.5$°$

3.  -79$°$

4.  +118.5$°$ 

The total number of isomers possible for the molecular formula C₇H₈O are:

1. 3

2. 4

3. 5

4. 6

The number of geometrical isomers of

${\mathrm{CH}}_3\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CHCl}$
$$ are

1. 4

2. 6

3. 8

4. 10

${\mathrm{C}}_3{\mathrm{H}}_9\mathrm{N}$ can not represent

1. quaternary salt

2. $1°$ amine

3. $2°$ amine

4. $3°$ amine

The number of primary amines of the formula ${\mathrm{C}}_4{\mathrm{H}}_{11}\mathrm{N}$ are:
1. 1
2. 3
3. 4
4. 5

The two optical isomers given below, namely

 and  are

1. enantiomers

2. geometrical isomers

3. structural isomers

4. diastereomers

Which of the following is an isomer of ethanol?

The maximum number of carbon atoms arranged linearly in the molecule,  ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C}-\mathrm{CH}={\mathrm{CH}}_{\mathrm{2,}}$ are -

1. 3

2. 4

3. 5

4. 6

the optically active tartaric acid is named as D-(+)- tartaric acid because it has a positive

1.  optical rotation: and is derived from D-glucose

2. pH in an organic solvent

3. optical rotation and is derived from D-(+)-glyceraldehyde

4. optical rotation only when Substituted by deuterium