$CH_3 CH_2 OH$ $\xrightarrow{Cl_2} CH_3 CHO$ $\xrightarrow{3 Cl_2} Cl_3 CCHO$. In the above reactions,the role of $Cl_2$ in step-$1$ and step-$2$ respectively is:
- Aoxidation,chlorination
- Breduction,chlorination
- Coxidation,addition
- Dreduction,substitution
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