Which compound in the following will give only one mono-chlorination product in the presence of light?

Which product is the major product in the photobromination of $2$-methylbutane?

Consider the isomers of the hydrocarbon with molecular formula $C_5H_{10}$. These isomers do not decolourise $KMnO_4$ solution. These isomers are subjected to chlorination with chlorine in the presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed from all these isomers is . . . . . . .

In the Fischer-Tropsch synthesis of petrol,$.....$ and $.....$ are used as the raw materials.

When sodium propionate is heated with soda lime,the main product is

Which of the following is $NOT$ obtained when a mixture of bromoethane and $1$-bromopropane is treated with sodium metal in dry ether?