$CH_4$ gas is obtained in :-
$(a)$ Hydrolysis of $Al_4C_3$
$(b)$ Hydrolysis of $Be_2C$
$(c)$ Hydrolysis of $Mg_2C_3$
$(d)$ Hydrolysis of $CaC_2$

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)

What is formed when isobutylmagnesium bromide reacts with absolute alcohol?

Write the reaction for the preparation of ethane from the following:
$(i)$ Ethene
$(ii)$ Ethyl chloride

For complete combustion of $10 \ L$ of alkane,the volume of oxygen required is $50 \ L$. Identify the alkane.

Explain why lower alkanes are gaseous in state and higher alkanes are liquid in state?