Refer the below equation:

Question

$(a)\;C_2H_5-Cl,C_2H_5-O-C_2H_5$

$(b)\;C_2H_6,C_2H_5-O-C_2H_5$

$(c)\;C_2H_5-Cl,C_2H_5-ONO$

$(d)\;C_2H_6, C_2H_5NO_2$