State the valency of each carbon atom in $(i)$ an alkane and $(ii)$ an alkyne.

Which of the following is used in conveyor belts?

Which substance,when added as an adulterant to ethanol used as an intoxicating drink,causes a person to lose their vision?

Identify the unsaturated compounds from the following:
$(i)$ Propane
$(ii)$ Propene
$(iii)$ Propyne
$(iv)$ Chloropropane

What is the molecular formula of methanal?

$A$ salt $X$ is formed and a gas is evolved when ethanoic acid reacts with sodium hydrogencarbonate. Name the salt $X$ and the gas evolved. Describe an activity and draw the diagram of the apparatus to prove that the evolved gas is the one which you have named. Also,write the chemical equation of the reaction involved.