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【简答题】
从甲苯出发，按下面流程可以合成苯甲酸苯甲酯和水杨酸： 已知水杨酸的结构 ，请回答： （1）写出水杨酸中含氧官能团的名称 。 （2）反应①的条件为： ，F的结构： 。 （3）反应⑨的化学方程式为： 。 （4）反应③的反应类型为 。 （5）③、④两步反应能否互换 （填“能”或“否”），原因是 。
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