A compound having the shortest carbon-carbon bond length among the following is :

1. Benzene                                 

2. Ethene

3. Ethyne                                   

4. Ethane

Which of the following compounds has the lowest boiling point?

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

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

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

4. ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$

The shortest $\mathrm{C}-\mathrm{C}$ bond distance is found in:

1. Diamond 

2. Ethane

3. Benzene

4. Acetylene

The distance between two adjacent cabron atoms is largest in

1. benzene 

2. ethene

3. butane

4. ethyne

In benzene, $\mathrm{C}-\mathrm{C}$ bond length is 1.39 $\stackrel{°}{\mathrm{A}}$; the $\mathrm{C}-\mathrm{H}$ bond length is:

1. 1.39 

2. 1.08

3. 1.54

4. 1.46

Propadiene, $C_3{H}_4$ molecule contains:

1. Two $s{p}^2$and one sp hybrid carbon atom

2. One $s{p}^2$ and two sp hybrid carbon atoms

3. One $s{p}^2$ and three sp hybrid carbon atoms

4. None of the above.

Which of the following compounds has the highest melting point?

1. ${\mathrm{C}}_4{\mathrm{H}}_{10}$ $$ $$                                 

2. ${\mathrm{C}}_5{\mathrm{H}}_{12}$

3. ${\mathrm{C}}_6{\mathrm{H}}_{14}$ $$                                  

4. ${\mathrm{C}}_7{\mathrm{H}}_{16}$

The linear molecules among the following is:

1.  ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C}-{\mathrm{CH}}_3$
2.  ${\mathrm{CH}}_2=\mathrm{CH}-{\mathrm{CH}}_2-\mathrm{C}\equiv \mathrm{CH}$
3.  ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$
4.  ${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$

Reactivity of chlorine and bromine towards methane at 275$°C$ differs by a factor nearly

1. ${10}^3$

2. ${10}^4$

3. ${10}^2$

4. $>{10}^5$

Which compound among the following has the highest boiling point?