5(iv)
Give reasons:
(a) Ethene undergoes addition reaction.
(b) Hydrocarbons can be used as fuels.
(c) Hydrogen chloride gas cannot be collected over water.
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(a) In case of ethene, the valencies of atleast 2 carbon atoms are not fully satisfied by hydrogen atoms. The availability of electrons in the double bond makes them more reactive and hence they undergo addition reactions only.
(b) Hydrocarbons are highly combustible and they produce good amount of heat hence they are used as a fuel.
(c) Hydrogen chloride gas is not collected over water since it is highly soluble in water.