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

Which reaction produces acrylonitrile (${\mathrm{CH}}_2=\mathrm{CHCN}$)?

1. Ethyne $\underset{{\mathrm{Ba}}^{2+}}{\overset{\mathrm{HCN}}{\to }}$                           

2. Acrylic acid $\stackrel{\mathrm{KCN}}{\to }$

3. Ethyne $\stackrel{\mathrm{KCN}}{\to }$                           

4. Ethyne $\stackrel{\mathrm{HOCl}}{\to }$

 is not converted to  by:

1. Wolff-Kishner reaction

2. Clemmensen reduction

3. Red P + HI at $200°\mathrm{C}$

4. Wurtz's reaction

Products of the following reaction

${\mathrm{CH}}_3\mathrm{C}\equiv \mathrm{C}.{\mathrm{CH}}_2{\mathrm{CH}}_3\underset{\left(\mathrm{ii}\right)\hspace{0.17em}\mathrm{Hydrolysis}}{\overset{\left(\mathrm{i}\right) {\mathrm{O}}_3}{\to }}$... are

1. ${\mathrm{CH}}_3\mathrm{CHO}$ + ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CHO}$

2. ${\mathrm{CH}}_3\mathrm{COOH}$ + ${\mathrm{CH}}_3{\mathrm{COCH}}_3$

3. ${\mathrm{CH}}_3\mathrm{COOH}$ + $\mathrm{HOOC}.{\mathrm{CH}}_2{\mathrm{CH}}_3$

4. ${\mathrm{CH}}_3\mathrm{COOH}$ + ${\mathrm{CO}}_2$

Acetylene reacts with 42% ${\mathrm{H}}_2{\mathrm{SO}}_4$ containing 1% ${\mathrm{HgSO}}_4$ to give:

1. ${\mathrm{C}}_2{\mathrm{H}}_5{\mathrm{HSO}}_4$                               

2. ${\mathrm{CH}}_3\mathrm{CHO}$

3. HCHO                                       

4. ${\mathrm{CH}}_2={\mathrm{CH}}_2$

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