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

(2) One $s{p}^2$ and two sp hybrid carbons

(3) One $s{p}^2$ and three sp hybrid carbons

(4) None of these

The compound that has the maximum melting point among the following is-

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. $>{10}^5$

A compound having the highest boiling point among the following is -