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

What is the end product of the following sequences of operations?

         ${\mathrm{CaC}}_2\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }$ A $\underset{{\mathrm{Hg}}^{2+}}{\overset{\mathrm{Dil}.{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}$ B  $\underset{{\mathrm{H}}_2}{\overset{\mathrm{Ni}}{\to }}$ C 

$\mathrm{CH}\equiv \mathrm{CH}\stackrel{{\mathrm{O}}_3/\mathrm{NaOH}}{\to }$X$\stackrel{\mathrm{Zn}/{\mathrm{CH}}_3\mathrm{COOH}}{\to }$Y. Y is:

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

3. ${\mathrm{CH}}_3\mathrm{COOH}$                                 4. ${\mathrm{CH}}_3\mathrm{OH}$

Acetylene on reacting with hypochlorous acid gives:

1. ${\mathrm{CH}}_3\mathrm{COCl}$                                   2. ${\mathrm{ClCH}}_2\mathrm{CHO}$

3. ${\mathrm{Cl}}_2\mathrm{CH}.\mathrm{CHO}$                                4. ${\mathrm{ClCH}}_2\mathrm{COOH}$

1-butyne on reaction with hot alkaline ${\mathrm{KMnO}}_4$ gives:

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

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

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

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

An octane number 100 is given to:

1. n-hexane                              2. iso-octane 

3. neo-pentane                          4. neo-octane 

Which is the most suitable reagent among the following to distinguish compound (III) from rest of the compounds?

I. ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C}-{\mathrm{CH}}_3$

II. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

III. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{C}\equiv \mathrm{CH}$

IV. ${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2$

1. ${\mathrm{Br}}_2$/${\mathrm{CCl}}_4$                                        2. ${\mathrm{Br}}_2$/${\mathrm{CH}}_3\mathrm{COOH}$

3. Alk.${\mathrm{KMnO}}_4$                                     4. Ammoniacal ${\mathrm{AgNO}}_3$

A mixture of ethane, ethene and ethyne is passed through ammoniacal ${\mathrm{AgNO}}_3$ solution. The gases which remain unreacted are:

 1. Ethane and ethene                 
 2. Ethane and ethyne
 3. Ethene and ethyne               
 4. Ethane only

Ozonolysis of buta-1,3-diene gives:

1. HCHO and glyoxal

2. ${\mathrm{CH}}_3\mathrm{CHO}$ and glyoxal

3. ${\mathrm{CO}}_2$ and glyoxal

4. HCHO + glyoxal + ${\mathrm{CH}}_3\mathrm{CHO}$

Hydroxylation of propyne in the presence of ${\mathrm{HgSO}}_4/{\mathrm{H}}_2{\mathrm{SO}}_4$ is initiated by the attack of:

1. Carbene                                   

2. Free radical

3. Electrophile                               

4. Nucleophile