Which alkene has smallest heat of hydrogenation ?

In  the decreasing order of bond length will be

1. I>II>III

2. II>III>I

3. III>II>I

4. II>I>III

The correct order of abstraction of hydrogen toward homolytic fission is:

1. 2 > 4 > 3 > 5 > 1

2. 4 > 2 > 5 > 3 > 1

3. 4 > 2 > 3 > 5 > 1

4. 4 > 3 > 2 > 5 > 1

In the above compound, at which bond proton $\left({\mathrm{H}}^{+}\right)$ attacks fastest ?

1. A

2. B

3. C

4. D

The most stable free radical is 

Consider the following carbocations 

The correct order of stability is 

1. II>III>I>IV

2. III>I>II>IV

3. III>I>IV>II

4. II>IV>I>III

Consider the following resonating structures of HCOOH

The order of stability is-

The correct order of the rate of expulsion of hydrogen as ${\mathrm{H}}^{+}$ in the above figure is:

1. 1 > 2 > 3

2. 2 > 3 > 1

3. 2 > 1 > 3

4. 3 > 2 > 1

Which alkene is most stable ?

1. ${\mathrm{CH}}_2=\mathrm{CH}-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

2. ${\left({\mathrm{CH}}_3\right)}_{3}C-CH=C{H}_2$

3. ${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$

4. ${\left({\mathrm{CH}}_3\right)}_{2}C=C{\left(C{H}_3\right)}_2$

The aromatic compound among the following is :