A．含烴及烴的衍生物，都能在氧氣中燃燒，故A正確；
B．乙烯、氯乙烯都能發生加成反應，使溴水褪色，而聚氯乙烯不能，故B錯誤；
C．乙烯、氯乙烯都能使得酸性高錳酸鉀褪色，而聚氯乙烯不能，故C錯誤；
D．氯乙烯為平面結構，則分子中所有原子***平面，故D正確；
故答案為：AD；
（2）由合成路線可知，二氯乙烷熱裂解生成HCl，再用於合成氯乙烷，從而使氯得到利用，不向環境排放有害氣體，
故答案為：二氯乙烷熱裂解所產生的氯化氫被循環利用，從而避免向環境排放有害氣體；
（3）根據框圖轉化關系和質量守恒可知1，2-二氯乙烷熱裂解成氯乙烯和氯化氫，反應方程式為：ClCH2CH2Cl
| 高溫 |
故答案為：ClCH2CH2Cl
| 高溫 |
（4）采用逆推法分析：C2H5OOCCOOC2H5←
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