In the following reaction the catalyst used is:

         $\to$${\mathrm{C}}_6{\mathrm{H}}_6$ + 3${\mathrm{H}}_2$

1. ${\mathrm{Cr}}_2{\mathrm{O}}_3$                                      2. $A{l}_2{\mathrm{O}}_3$

3. Zn dust                                    4. ${\mathrm{Cr}}_2{\mathrm{O}}_3$ and $A{l}_2{\mathrm{O}}_3$

Silver acetylide when heated with HCl gives:

1. ${\mathrm{C}}_2{\mathrm{H}}_2$

2. ${\mathrm{H}}_2$

3. ${\mathrm{C}}_2{\mathrm{H}}_4$ 

4. ${\mathrm{C}}_6{\mathrm{H}}_6$

$\hspace{0.17em}\mathrm{R}-{\mathrm{CH}}_2-{\mathrm{CCl}}_2-\mathrm{R}\stackrel{\mathrm{Reagent}}{\to }$$\mathrm{R}-\mathrm{C}\equiv \mathrm{C}-\mathrm{R}$.
The reagent is: 

1. Na                                     
2. HCl in ${\mathrm{H}}_2\mathrm{O}$
3. NaNH₂               
4. Zn in alcohol 

Which of these will not react with acetylene?

1. NaOH                                       
2. Amm. ${\mathrm{AgNO}}_3$
3. Na                                           
4. HCl

Alkene-1 on hydroboration followed with action of ${\mathrm{H}}_2{\mathrm{O}}_2$ gives:

1. alkanol-2 

2. alkanol-1

3. alkanal 

4. alkanone

The reaction,

$\stackrel{{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }$ is the example of:

1. sulphonation 

2. dehydration

3. alkylation

4. decomposition

2-bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is  

1. 2-ethoxypentane               
2. pent-1-ene
3. trans-pent-2-ene               
4. cis-pent-2-ene

RCOCl and ${\mathrm{AlCl}}_3$ are used in the Friedel-Crafts reaction.
The electrophile among the following is:

1. ${\mathrm{Cl}}^{+}$                                       

2. RCOCl

3. $\mathrm{R}\stackrel{+}{\mathrm{C}}$O                                     

4. ${\mathrm{R}}^{+}$

Gammexane (a $\mathrm{\gamma }$-isomer) is:

1. BHC
2. Benzene hexachloride
3. Lindane
4. All of the above

An alkene, obtained by the dehydration of an alcohol (A), on ozonolysis gives two molecules of acetaldehyde for every molecule of alkene. The alcohol (A) is:

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

2. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$

3. ${\mathrm{CH}}_3\mathrm{CH}={\mathrm{CHCH}}_2\mathrm{OH}$   

4.