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. ${\mathrm{R}}^{+}$

The reaction of toluene with Cl₂ in the presence of FeCl₃ gives predominantly:

1. Benzoyl chloride

2. Benzyl chloride

3. o-and p-Chlorotoluene

4. m-Chlorotoluene

The reaction, is the example of:

1. Sulphonation 

2. Dehydration

3. Alkylation

4. Decomposition

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

Which of these will not react with acetylene?

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

$\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 

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. ${\mathrm{C}}_6{\mathrm{H}}_6$

In the following reaction the catalyst used is:

1. \(\left(Cr\right)_{2} O_{3}\)                            2. \(A l_{2} O_{3}\)

3. \(Zn~ dust\)                            4. \(Cr_{2} O_{3}\) and \(A l_{2} O_{3}\)

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

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