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Cinnamaldehyde has important applications in food, medicine and chemical industry. (1) The following is the reaction route of synthesizing cinnamaldehyde to prepare cinnamic acid: experiment.
(1) hydroxyl aldehyde group (2 points)?
(2) (2 points)
(3) ? (3 points)
(4) Addition, subtraction, multiplication and division (***2 points)
(5) Protect carbon and carbon bonds to prevent them from being oxidized (2 points)