The reaction of sodium acetate and sodalime gives

$A$ dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is

The reaction of $n$-butane with bromine in the presence of light at $725\,^oC$ yields ...................

$A$ mixture of propene and methane is obtained by the cracking of

Arrange the following alkanes in decreasing order of their heats of combustion:
$(i)$ $CH_3-C(CH_3)_2-CH_3$ (Neopentane)
$(ii)$ $CH_3-CH(CH_3)-CH_2-CH_3$ (Isopentane)
$(iii)$ $CH_3-CH_2-CH_2-CH_2-CH_3$ ($n$-pentane)

The maximum number of isomers (including stereoisomers) that are possible on monochlorination of the following compound is: