Reactivity of chlorine and bromine towards methane at 275$°C$ differs by a factor nearly

1. ${10}^3$

2. ${10}^4$

3. ${10}^2$

4. $>{10}^5$

An organic molecule necessarily shows optical activity if it -

1. Contains asymmetric carbon atoms

2. Is non-planar

3. Is non-superimposable on its mirror image

4. Is superimposable on its mirror image

Acetylene and HCHO reaction to the presence of copper acetylide catalyst to form

1. 2-Butyne-1,4-diol

2. But-2-yne-1,2-diol

3. But-1-yne-1,4-diol

4. None of these

On the addition of HBr to propene in the absence of
peroxides,the first step involves the addition of

(1) H⁺

(2) Br-

(3) H

(4) Br

When ethyl bromide and n-propyl bromide is allowed
to react with sodium, in ether, they form

(1) mixture of four alkanes

(2) mixture of three alkanes

(3) mixture of two alkanes

(4) single alkane

The compound that has least hindered rotation around carbon-carbon bond is-

A compound having the highest boiling point among the following is - 

 [A] and [B]  in the  mentioned reaction are respectively -

1. Alc. KOH and ${\mathrm{NaNH}}_2$

2. ${\mathrm{NaNH}}_2$ and Lindlar catalyst

3. ${\mathrm{NaNH}}_2$ and alcoholic KOH

4. Lindlar catalyst and ${\mathrm{NaNH}}_2$

Benzene reacts with ${\mathrm{CH}}_3\mathrm{COCl}$ in the presence of anhydrous ${\mathrm{AlCl}}_3$ to give

(1) ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_3$

(2) ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl}$

(3) ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{O}}_2\mathrm{Cl}$

(4) ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{COCH}}_3$

Acidic hydrogen present among the following compound is -

1. Ethyne

2. Ethene

3. Benzene

4. Ethane