C-11-Q023mediumsingle_mcqবেনজিনের সংকেত—aC6H6\mathrm{C_6H_6}C6H6bC6H12\mathrm{C_6H_{12}}C6H12cC10H8\mathrm{C_{10}H_8}C10H8dC7H8\mathrm{C_7H_8}C7H8