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  1. Empirical formula of a compound is CH₂O.If its molecular weight is 180,
  2. Which one of the following moleculescontains no π bond?
  3. The isomerism represented by ethyl acetoacetate is
  4. Which one of the following ionic species has the greatest proton affinity to form
  5. The maximum number of electrons in a subshell is given by the expression