Some important physical properties of ethyne (acetylene) are given below:
(i) Physical state and odour: Ethyne (acetylene) is a color less gas with ether-like odour when pure. Ethyne prepared from calcium carbide has garlic odour due to the presence of impurities like phosphine (PH3) and hydrogen sulphide (H2S).
(ii) Solubility: Ethyne is slightly soluble in water, business highly soluble in organic solvents like acetone and alcohol.
(iii) Density: Ethyne is lighter than air.
(iv) Character: Ethyne is poisonous gas. Liquid ethyne (acetylene) is highly explosive.
(v) Boiling point: Ethyne (acetylene) boils atomic -84°C(189K).