题目

It was an old day when I set out for a run in Moab, Utah, with my dog, Taz. As an athlete I often went for a run by myself. While running along a canyon (峡谷) road, I hit a piece of ice. I slipped down the rock face and fell 60 feet into the canyon, landing on a ledge (岩脊). Taz found his way to me, so I knew there must be a way out of the canyon, but I couldn’t stand, as I had broken an important bone.I shouted for help but then decided to move to the bottom of the canyon first. The ledge was too dangerous to stay. It took me five hours to go a quarter of a mile. Eventually it got dar今有化合物甲：,乙：，丙：(1)请写出丙中含氧官能团的名称：__________________。(2)请判别上述哪些化合物互为同分异构体：______________________________。(3)请分别写出鉴别甲、乙、丙三种化合物的方法(指明所选试剂及主要现象即可)。鉴别甲的方法：____________________。鉴别乙的方法：____________________。鉴别丙的方法：____________________。(4)请按酸性由强至弱排列甲、乙、丙的顺序：__________。