A process for the manufacture of CF.sub.3CH.sub.2CHF.sub.2 and CF.sub.3CH.sub.2CF.sub.3 is disclosed. The process involves (a) reacting HF and at least one halopropene of the formula CX.sub.3CCl.dbd.CClX (where each X is independently F or Cl) to produce a product including both CF.sub.3CCl.dbd.CF.sub.2 and CF.sub.3CHClCF.sub.3; (b) reacting CF.sub.3CCl.dbd.CF.sub.2 and CF.sub.3CHClCF.sub.3 produced in (a) with hydrogen to produce a product including both CF.sub.3CH.sub.2CHF.sub.2 and CF.sub.3CH.sub.2CF.sub.3; and (c) recovering CF.sub.3CH.sub.2CHF.sub.2 and CF.sub.3CH.sub.2CF.sub.3 from the product produced in (b). In (a), the CF.sub.3CCl.dbd.CF.sub.2 and CF.sub.3CHClCF.sub.3 are produced in the presence of a fluorination catalyst including a ZnCr.sub.2O.sub.4/crystalline .alpha.-chromium oxide composition, a ZnCr.sub.2O.sub.4/crystalline .alpha.-chromium oxide composition which has been treated with a fluorinating agent, a zinc halide/.alpha.-chromium oxide composition and/or a zinc halide/.alpha.-chromium oxide composition which has been treated with a fluorinating agent.