(20 10? Zaozhuang Yimei) [Basis of Chemistry-Organic Chemistry] wwX is an important organic substance, which can react with FeCl3 _ 3 solution and turn purple. Known: (1) write.

According to the structure generated by the transformation of B, para-position substitution occurs under the condition of catalyst to generate A, and A is hydrolyzed to generate B, so A is equal and B is equal. According to the molecular formula C9H1OO3 of C, the phenyl methyl group connected in the middle is oxidized to -COOH, so C is purple and X contains phenolic hydroxyl groups. According to the transformation relation and the molecular formula of x, the reaction can be carried out under the condition of HI.

Under the condition of sodium hydroxide aqueous solution, Y is hydrolyzed to generate D and M, Y contains ester group, and M is acidified to obtain E, so E is carboxylic acid, D can be acidified with silver ammonia solution to obtain E, and D contains -CHO. According to the title information, Y contains -C=C-OOC- structure, and from G, both D and E contain 2 carbon atoms, so Y is CH2=CHOOCCH3.

(1) As can be seen from the above analysis, E is CH3COOH and contains carboxyl groups. Reaction ② is produced by hydrolysis reaction.

Therefore, the answer is: carboxyl, hydrolysis reaction;

(2) From the above analysis, we can see that the structure of X is simplified as, so the answer is:

(3) Reaction ⑤: CH2=CHOOCCH3, and the hydrolysis reaction and neutralization reaction of the ester generate CH3CHO and CH3COONa. The reaction equation is: Ch3cooch = CH2+H2O NaOH △ Ch3cooh+Ch3cooh, CH3COOH+NaOH→H3COONa+H2O.

So the answer is: ch3cooch = CH2+H2O NaOH △ ch3cooh+ch3cho, ch3cooh+NaOH → h3coona+H2O;

(4) The isomer of C (C9H 10O3) can react with FeCl3 _ 3 solution, containing phenolic hydroxyl group and no -CH2-, which meets the requirements and has a simple structural formula.

So the answer is: