The addition of `O_(2)` gas to a reaction mixture of `CH_(4) and Cl_(2)` undergoing photochlorination will

H_(2)C=CH-Cl can undergo :

CH_(3)CH_(2)Cl undergoes homolytic fission produces:

CH_(3)CH_(2)Cl undergoes homolytic fission, produces

What products are formed when the mixture of CH_(4) and Cl_(2) is exposed to direct sunlight?

CH_(3)CH_(2)Cl undergoes homolytic fission to produce

The reaction of compounf P with CH_(3)MgBr (excess) in (C_(2)H_(5)_(2)O followed by addition of H_(2)O give Q the compound Q on treatment with H_(2)SO_(4) at 0^(@) C gives R. the reaction of R with CH_(3) COCl in the presence of anhydrous AlCl_(3)"in" CH_(2)Cl_(2) followed by treatment with H_(2)O produces compound S. [Et in compound P is ethyl group] The product S is