8(iii)
The following diagram shows the laboratory preparation of a gaseous hydrocarbon (P) containing two carbon atoms.
(a) Identify the gaseous product P.
(b) Give the general formula of the homologous series which P belongs to.
(c) Write a balanced equation for the reaction that takes place.
(d) State the type of reaction that P undergoes when it reacts with hydrogen.
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(a) P is ethyne (acetylene), C2H2.
(b) The general formula of the homologous series (alkynes) is CnH2n-2.
(c) CaC2 + 2H2O ⟶ Ca(OH)2 + C2H2
(d) It undergoes an addition reaction with hydrogen.