Which metal is used in Wurtz synthesis?

Write the $IUPAC$ name and molecular formula for the alkane series containing $1$ to $10$ carbon atoms.

Photochemical chlorination of alkane is initiated by a process of

Select the chain propagation steps in the free-radical chlorination of methane.
$(1) \, Cl_2 \to 2Cl^{\bullet}$
$(2) \, Cl^{\bullet} + CH_4 \to CH_3Cl + H^{\bullet}$
$(3) \, Cl^{\bullet} + CH_4 \to CH_3^{\bullet} + HCl$
$(4) \, H^{\bullet} + Cl_2 \to HCl + Cl^{\bullet}$
$(5) \, CH_3^{\bullet} + Cl_2 \to CH_3Cl + Cl^{\bullet}$

If the octane number of a sample of petrol is $40$,it is a mixture of........and............

What is obtained by the electrolysis of an aqueous solution of $CH_3COOK$?