deduce the molecular and/or empirical formula of a compound, given its structural, displayed or skeletal formula

deduce the possible isomers for an organic molecule of known molecular formula

describe and explain the reactions of halide ions with: (a) aqueous silver ions followed by aqueous ammonia (the formation and formula of the \([Ag(NH_3)_2]^+\) complex is not required) (b) concentrated sulfuric acid, to include balanced chemical equations