1. An organic compound (A) of molecular formula C2H5Cl is identified as Chioroethane with molecular formula CH2 -CH2 Cl from the formula.
2. Chioroethane reacts with aqueous KOH to give ethanol, i.e., Aqueous C2H5OH as (B) by substitution reaction.
CH3 - CH2Cl + KOH → CH3 - CH2OH [Ethanol (B)]+KCl
3. ChIooethane reacts with alcoholic KOH to give ethene C2H4 as (C) by elimination reaction