Which of the following alkane cannot be made in good yield by Wurtz reaction?

1.	2,3-Dimethylbutane	2.	n-Heptane
3.	n-Butane	4.	n-Hexane

An alkene on ozonolysis gives methanal as one of the products. Its structure is:

1.		2.
3.		4.

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 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-

Which compound among the following has the highest boiling point?

 [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 ${\mathrm{NaNH}}_2$