What is the end product of the following sequences of operations?

$\mathrm{CaC}_2 \xrightarrow{\mathrm{H}_2 \mathrm{O}} \mathrm{~A} \xrightarrow[\mathrm{Hg}^{2+}]{\mathrm{Dil} \cdot \mathrm{H}_2 \mathrm{SO}_4} \mathrm{~B} \underset{\mathrm{H}_2}{\stackrel{\mathrm{Ni}}{\rightarrow}} \mathrm{C}$

1. Methyl alcohol

2. Acetaldehyde

3. ${\mathrm{Ethanol}}_{}$

4. ${\mathrm{Ethene}}_{}$

Alkynes can be reduced to alkenes by hydrogenation in presence of:

1. raney Ni 

2. anhy. ${\mathrm{AlCl}}_3$

3. Pd 

4. Lindlar's catalyst

$\mathrm{R}-\mathrm{CH}={\mathrm{CH}}_2\underset{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\overset{\mathrm{Na}/{\mathrm{NH}}_3\left(\mathrm{l}\right)}{\to }}$${\mathrm{RCH}}_2{\mathrm{CH}}_3$ is called:

1. Clemmensen reduction 

2. Fisher-Spier reduction                   

3. Birch reduction

4. Arndt-Eistert reduction                   

The cylindrical shape of an alkyne is due to 

1. three sigma $\mathrm{C}-\mathrm{C}$ bonds

2. three $\mathrm{\pi }$ $\mathrm{C}-\mathrm{C}$ bonds

3. two sigma $\mathrm{C}-\mathrm{C}$ and one $\mathrm{\pi }$ $\mathrm{C}-\mathrm{C}$ bonds

4. one sigma $\mathrm{C}-\mathrm{C}$ and two$\mathrm{\pi }$ $\mathrm{C}-\mathrm{C}$ bonds

Octane no. of a fuel can be increased by:

1. isomerism 

2. alkylation

3. reforming 

4. all of these

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

1. Diamond 

2. Ethane

3. Benzene

4. Acetylene

Benzene reacts with n-propyl chloride in the presence of anhydrous ${\mathrm{AlCl}}_3$ to give

1. 3-propyl-1-chlorobenzene

2. n-propyl benzene

3. no reaction

4. iso-propyl benzene

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