Benzene HNO3/H2SO4 Nitrobenzene (P) Sn/HCl Aniline (Q) (CH3CO)2O Acetanilide (R)
R HNO3/H2SO4 p-Nitroacetanilide (S) HCl/EtOH,Δ p-Nitroaniline (T)
T = p-Nitroaniline (O2N−C6H4−NH2), molecular formula C6H6N2O2
Molar mass = 6(12)+6(1)+2(14)+2(16)=72+6+28+32=138 g/mol
% N = 13828×100=20.29%
Nearest integer = 20