1,1-dichloropropane is converted into propanal by reacting with aqueous sodium hydroxide through a sequence of stages. $\text{CH}_3\text{CH}_2\text{CHCl}_2 \xrightarrow{\text{NaOH(aq)}} \text{CH}_3\text{CH}_2\text{CHO}$ Which term is used to describe the first stage of this reaction?
- Aaddition
- Belimination
- Coxidation
- Dsubstitution