What is the product formed when $(CH_3)_3CMgCl$ reacts with $D_2O$?

Among the isomeric alkanes of molecular formula $C_{5}H_{12}$,identify the one that on photochemical chlorination yields:
$(i)$ $A$ single monochloride.
$(ii)$ Three isomeric monochlorides.
$(iii)$ Four isomeric monochlorides.

Which of the following compounds is insoluble even in hot concentrated $H_2SO_4$?

In the alkane $CH_3-CH_2-C(CH_3)_2-CH_2-CH(CH_3)_2$,identify $1^{\circ}$,$2^{\circ}$,and $3^{\circ}$ carbon atoms and give the number of $H$ atoms bonded to each one of these.

The major product obtained in the photo-catalyzed bromination of $2-$methylbutane is:

Which of the following is obtained as the major product when an excess of methane is treated with a limited amount of chlorine in the presence of $UV$ light?