Which of the following compounds will show metamerism?

1.  ${\mathrm{CH}}_3-\mathrm{O}-{\mathrm{C}}_2{\mathrm{H}}_5$

2.  ${\mathrm{CH}}_3-\mathrm{O}-{\mathrm{CH}}_3$

3.  ${\mathrm{CH}}_3-\mathrm{CO}-{\mathrm{C}}_2{\mathrm{H}}_5$

4.  ${\mathrm{C}}_2{\mathrm{H}}_5-\mathrm{S}-{\mathrm{C}}_2{\mathrm{H}}_5$

In the boat conformation of cyclohexane, the most destabilizing interaction is: 

1. eclipsing

2. flagpole-flagpole

3. 1,3-diaxial

4. 1,3-diequatorial

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 the given compound:

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

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

What is the relation between the two optical isomers given below?

 and 

1. Enantiomers

2. Geometrical isomers

3. Structural isomers

4. Diastereomers

Which of the following is an isomer of ethanol?