Is ch3cl2 possible? if yes what is the structure if it?

No, it is not possible

Explanation:

carbon is a tetravalent element. which means that it can form covalent bonds with various other elements as it has 4 electrons in its valence shell. in this compound, CH3Cl2, 3 electrons are already occupied with hydrogen. the only remaining electrom can be taken by a chlorine element forming a compound Chloromethane. but there is no space for another atom of chlorine to form CH3Cl2. therefore this compound is not possible