When ${\mathrm{CaC}}_2$ was hydrolysed a gas was obtained. It had a garlic odour due to phosgene present as impurity. The gas was passed through ammoniacal solution of ${\mathrm{Cu}}_2{\mathrm{Cl}}_2$, a red ppt. was obtained. The gas was:

1. ethylene                                       

2. propyne

3. acetylene                                     

4. ethane

Which of the following compounds with molecular formula, ${\mathrm{C}}_5{\mathrm{H}}_{10}$ yields acetone on ozonolysis?

1. 2-methyl-2-butene

2. 3-methyl-1-butene

3. Cyclopentane

4. 2-methyl-1-butene

Ozonolysis (${\mathrm{O}}_3$, ${\mathrm{H}}_2{\mathrm{O}}_2$) of, ${\mathrm{CH}}_3-\underset{{\mathrm{CH}}_3}{\underset{|}{\mathrm{CH}}}-\mathrm{C}\equiv \mathrm{C}-{\mathrm{CH}}_3$ gives :

1.  ${\mathrm{CH}}_3\underset{{\mathrm{CH}}_3}{\underset{|}{\mathrm{CH}}}\mathrm{COOH}$+ ${\mathrm{CH}}_3\mathrm{COOH}$

2. ${\mathrm{CH}}_3\underset{{\mathrm{CH}}_3}{\underset{|}{\mathrm{CH}}}\mathrm{CHO}$ + ${\mathrm{CH}}_3\mathrm{CHO}$

3. ${\mathrm{CH}}_3\underset{{\mathrm{CH}}_3}{\underset{|}{\mathrm{CH}}}\mathrm{CHO}$ + ${\mathrm{CH}}_3\mathrm{COOH}$

4. none of the above

In a reaction, 

${\mathrm{CH}}_2={\mathrm{CH}}_2$$\underset{\mathrm{acid}}{\overset{\mathrm{Hypochlorous}}{\to }}$M$\stackrel{\mathrm{R}}{\to }$$\underset{{\mathrm{CH}}_2\mathrm{OH}}{\underset{|}{{\mathrm{CH}}_2\mathrm{OH}}}$

M = molecules, R = reagent. M and R are

1. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}$ and NaOH

2. ${\mathrm{CH}}_2\mathrm{Cl}.{\mathrm{CH}}_2\mathrm{OH}$ and aq. ${\mathrm{NaHCO}}_3$

3. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$ and HCl

4.  and heat

When 3,3-dimethyl-2-butanol is heated with conc.${\mathrm{H}}_2{\mathrm{SO}}_4$, 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

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

1. HCHO                                  2. HCOOH 

3. ${\mathrm{CH}}_3\mathrm{OH}$                                4. ${\mathrm{CH}}_2{\mathrm{OHCH}}_2\mathrm{OH}$

${}_{}$

In the above reaction, X is:

1. ${\mathrm{HNO}}_3$ 

2. ${\mathrm{O}}_2$

3. ${\mathrm{O}}_3$

4. ${\mathrm{KMnO}}_4$

The major product of the following reaction is:

 +  Alc.KOH $\to$  ?   

1. Butene

2. But-2-ene

3. Butane 

4. But-1-yne

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:

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

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