The decreasing order of boiling points is

The $C-H$ bond length is longest in which of the following?

Halogenation of alkanes is an example of which mechanism?

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

In the reaction of $1$-bromo-$3$-chlorocyclobutane with two equivalents of sodium in ether,the major product is

What do you mean by $Alkane$? Explain the formation of $Alkane$ from $Methane$ $(CH_{4})$,by substituting the hydrogen atoms with a $-CH_{3}$ group.