A. give the structures and provide an acceptable name for all the isomers of molecular formula c7h9n that contain a benzene ring.
b. which one of these isomers is the strongest base?
c. which, if any, of these isomers yield an n-nitroso amine on treatment with sodium nitrite and hydrochloric acid?
d. which, if any, of these isomers undergo nitrosation of their benzene ring on treatment with sodium nitrite and hydrochloric acid?

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -

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Aand x are the answers to your question.hope it !