(1)

(2)

(3) ? b

(4)

(5)

Test analysis: (1) According to the analysis of the information, the cinnamic aldehyde contains a benzene ring and an aldehyde group, and there is only one substituent group and there is no branched chain in the substituent group, therefore, the structural short formula of cinnamic aldehyde is .

(2) A and NaOH solution is a substitution reaction to produce B, so the chemical equation is .

(3) According to the transformation relationship diagram, there is no carbon-carbon double bond in substance Z, so the type of reaction that can not occur is polymerization, so choose b.

(4) According to the transformation relationship diagram, substance Y contains -COOH, and ethanol occurs in the esterification reaction, so the chemical equation is .

(5) According to the analysis of the conditions in the question, one isomer of Y contains ester and aldehyde groups, so the structural formula is .

Comments: This question is an organic inference question, to master the properties of substances determined by functional groups, is now the hot and difficult points of the college entrance examination.