The reaction steps are as follows:

C2H5Cl (Ethyl chloride) undergoes a dehydrohalogenation reaction to form C4H10 (Butane).C4H10 (Butane) undergoes a free radical halogenation reaction to form C4H9Cl (1-chlorobutane).C4H9Cl (1-chlorobutane) reacts with NaOH (sodium hydroxide) to form X.

The product X formed in the final reaction is likely to be sodium butoxide (C4H9ONa) as a result of the reaction between 1-chlorobutane and sodium hydroxide.