Ethyl acetoacetate exhibits:

(1) optical isomerism                

(2) geometrical isomerism

(3) tautomerism                   

(4) enantiomerism

Which of the following does not show stereo isomerism?

1. 

2. 

3. $\mathrm{H}$
$|$
${\mathrm{CH}}_3—\mathrm{C}—\mathrm{COOH}$
$|$
$\mathrm{H}$       

(4) $COOH$
$|$
$H—C—OH$
$H—C—OH$
$|$
$COOH$

Only two isomeric monochloro derivatives are possible for:

(1) n-butane

(2) 2,4-dimethylpentane

(3) benzene

(4) 2-methylbutane

Keto-enol tautomerism is observed in :

1. 

2. 

3. 

4. None of the above

Isomerism among compounds due to migration of a proton is known as:

1. Geometrical       

2. Optical

3. Tautomerism       

4. Position

The number of different amines corresponding to the formula C₃H₉N is:

1. 2

2. 3

3. 4

4. 5

 Alkyl cyanide \(R-C \equiv N\) and alkyl isocyanides \(R- \overset{+}{N} \equiv C^-\) are: 

Hydrogen cyanide and hydrogen isocyanide are:

1. tautomers

2. positional isomers

3. metamers

4. chain isomers

The non-staggered form(s) of ethane among the following is-

1.		2.
3.		4.	None of these

The optically active compound among the following is-