(person bb8? Malic acid widely exists in fruits and meat, and is a commonly used food additive. Oral mol malic acid has the same energy as human body molNaO.

1 diol malic acid can neutralize 2 diol olNaOt, indicating that the molecule contains 2 -COOts, which reacts with enough Na to release 1.5 diol T2, indicating that the molecule contains 5-ots (including -coot), and c is 1 5.82%,1. If O 1 is included, five small× 59. Right b% 16=5, and the molecular formula is C small t6O5. The hydrogen atoms in this molecule are in five different chemical environments, indicating that there are five different T atoms, and the structure should be, then J is, I is, and T is. From the data ②, we can know that E is Ct five CtO, A is Ct five Ct2Ot, and C is.

(1) According to the above analysis, malic acid is 0, so the answer is:

(2) The purpose of C → D reaction is to introduce halogen atoms, D is Br-Ct2-COOt, E is tO-Ct2-COONa, and the chemical equation for D to generate E is Br-CT2-Coot+2naot → To-CT2-Coona+Nabr+T2O.

So the answer is: introduce halogen atoms; & ampnbopbr-Ct2-COOt+2 naot→tO-Ct2-COONa+NaBr+t2O；

(5) In the above synthetic route, the addition reaction involved is the reaction of EG and the reaction of J producing malic acid, which are two steps, so the answer is: 2;

(Less) The product after eliminating one molecule of water by malic acid is: the polycondensation reaction equation with ethylene glycol is: under certain conditions, n+n to-ct2ct2-ot+(2n-1) t2o,

So the answer is: n+n&; NbopTO-Ct2Ct2-Ot has certain conditions +(2n- 1) t2o.