The number of structural isomers of ${\mathrm{C}}_4{\mathrm{H}}_{10}\mathrm{O}$ that are ethers is/are :

1.  1

2.  2

3.  3

4.  4 

Which of the following has a zero dipole moment?

1.  1-butene

2.  cis-2-butene

3.  trans-2-butene

4.  2 methyl-1-propene 

The total number of isomers of ${\mathrm{C}}_4{\mathrm{H}}_8$ are-

How many stereoisomers are there for tartaric acid?

1.  3

2.  4

3.  5

4.  0

The number of stereo isomer of the compound ${\mathrm{CH}}_3\mathrm{CHBrCHBrCOOH}$ is

1.  1

2.  2

3.  3

4.  4 

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