The reaction $CH_2 = CH_2 + H_2 \xrightarrow[250 - 300^{\circ}C]{Ni} CH_3 - CH_3$ is called:

When cyclohexane is added to water,it floats because:

Which hydrocarbon will be most stable?

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)

Identify the reactivity order for halogens towards alkanes.

Octane number has $0$ value for