The invention relates to a process comprising contacting a composition comprising a (hydro)halocarbon and a compound of formula Rf—C≡CX with a basic solution comprising an hydroxide, an alkoxide and/or an amide to reduce the concentration of Rf—C≡CX, wherein Rf is a perfluorinated alkyl group and X is H, F, Cl, Br, or I. The invention further relates to process for preparing a (hydro)halocarbon comprising (i) converting a starting material, optionally in the presence of HF and/or a catalyst, to a composition comprising the (hydro)halocarbon and a compound of formula Rf—C≡CX, wherein Rf is a perfluorinated alkyl group and X is H, F, Cl, Br, or I; (ii) contacting the composition with a basic solution comprising an hydroxide, an alkoxide and/or an amide to reduce the concentration of the compound of formula Rf—C≡CX; and (iii) recovering the (hydro)halocarbon.