The gas responsible for explosions in coal mines is .......

Write the reactions for the preparation of ethane from the following:
$(i)$ Acetic acid $(CH_3COOH)$
$(ii)$ Methane $(CH_4)$
$(iii)$ Acetate ion $(CH_3COO^{-})$

Which of the following compounds is used in antiknock compositions to prevent the deposition of lead oxides on spark plugs,combustion chambers,and exhaust pipes?

What are $N$ and $M$?

Kolbe's electrolysis of sodium acetate at the anode gives:

Which of the following has the highest knocking property?