The product (A) in the following reaction is:

1. 3-Keto butanol

2. Butane-1,4-dial

3. 3-Oxo-butan-1-al

4. 2-Keto-butane-1,4-dial

$\stackrel{1\mathrm{eq}.\mathrm{NBS}}{\to }$ X$\stackrel{{\mathrm{PhO}}^{-}}{\to }$Y (major product)

The product Y is

The product (s) obtained via oxymercuration-dermercuration of butyne would be

1.                                2. 

3. +${\mathrm{CH}}_2\mathrm{O}$                    4.+ HCOOH

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

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}$

1. Na                                     
2. HCl in ${\mathrm{H}}_2\mathrm{O}$
3. KOH in ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$               
4. Zn in alcohol 

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 $A{l}_2{\mathrm{O}}_3$

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

1. BHC                                         

2. Benzene hexachloride

3. Lindane                                     

4. All of the above

During ozonolysis of ${\mathrm{CH}}_2={\mathrm{CH}}_2$, if hydrolysis is made in the absence of Zn dust, the products formed are:

When 3,3-dimethyl-2-butanol is heated with conc. H₂SO₄, the major product obtained is:

1. 2,3-Dimethyl-2-butene

2. 3,3-Dimethyl-2-butene

3. 2,3-Dimethyl-1-butene

4. Cis and trans-isomers of 2,3-dimethyl-2-butene