Identify the product ' B ' in the following reaction sequence.

$$\text { Alkyl halide } \xrightarrow[\text { Dry ether }]{\mathrm{Mg}} \mathrm{~A} \xrightarrow{\mathrm{NH}_3} \mathrm{~B}$$

Match column I (process) with column II (application)

	Column I		Column II
i.	Dialysis	a.	Cleansing action of soap
ii.	Peptization	b.	Coagulation
iii.	Emulsificatioin	c.	Colloidal solution preparation
iv.	Electrophoresis	d.	Purification of colloidal solution

Which of the following is the structure of an alcohol with molecular formula $\mathrm{C}_5 \mathrm{H}_{12} \mathrm{O}$ ?

Four vessels of same volume consist equal masses of four gases $\mathrm{H}_2, \mathrm{Cl}_2, \mathrm{~N}_2$, and $\mathrm{O}_2$ separately at same temperature. The pressure exerted by the gas is maximum for