MA = 5,75 x 16,0 = 92,0(g/mol)
⇒ 14n - 6 = 92 ⇒ n = 7
A là C7H8 hay C6H5-CH3 (toluen)
C6H5-CH3 + Cl2 \(\xrightarrow{{as,{t^0}}}\) C6H5CH2Cl + HCl (B: benzyl clorua)
C6H5-CH3 + 2KMnO4 \(\xrightarrow{{{t^0}}}\) C6H5-COOK + KOH + 2MnO2 + H2O (E: kali benzoat)