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【2026版化学高考步步高大二轮专题复习讲义江苏专用版七、有机化合物

  • 2026-03-29 05:24:31
【2026版化学高考步步高大二轮专题复习讲义江苏专用版七、有机化合物

(一)常考易错问题再提醒

1.有机物类别辨析(烃、芳香烃、苯的同系物、芳香族化合物、酚);主要成分为烷烃:天然气、液化石油气、汽油、柴油、煤油、凡士林、石蜡。

2.物理性质

水溶性

(1)亲水基团:羟基、醛基、羧基、氨基等。只有分子中含—OH、—NH2、—CHO、—COOH等官能团的低级化合物可溶于水,其余的一般只溶于有机溶剂;(2)疏水基团:—R(烃基)、苯环、酯基、卤素原子、硝基;(3)是否能与水形成分子间氢键,如含—OH的有机物苯酚在常温下微溶于水

熔、沸点

能形成分子间氢键则高,如对羟基苯甲醛;形成分子内氢键则低,如邻羟基苯甲醛

3.有机化合物官能团的确定和主要反应类型的判断

(1)主要反应类型的判断

取代反应

一般有H均可,有进有出,包含水解、酯化、硝化等;能发生水解反应的官能团:酯基、酰胺基、碳卤键

加成反应

碳碳双键、碳碳三键、苯环、羰基、醛基,只进不出、不饱和变饱和(变双为单)

加聚反应

碳碳双键、碳碳三键,只生成高分子

缩聚反应

羟基和羧基制备聚酯纤维,羧基和氨基制备聚酰胺纤维、制备酚醛树脂,生成高分子和小分子,如H2O、NH3、HX

消去反应

醇类和卤代烃,只出不进、饱和变不饱和(去单成双)、邻碳有氢

氧化反应

去H得O,燃烧、与O2、酸性KMnO4溶液、银氨溶液、新制Cu(OH)2溶液的反应,常被氧化成羧基

还原反应

去O得H

特别提醒:一般有机物都能发生氧化反应和取代反应

(2)使溴水褪色的有机物

含有碳碳双键、碳碳三键的有机物发生加成反应而褪色;含有醛基的有机物发生氧化反应而褪色;与苯酚发生取代反应生成白色沉淀使溴水褪色。

特别提醒:因萃取而褪色还有:液态饱和烃、液态饱和酯、苯及其同系物、氯仿、CCl4

(3)使酸性高锰酸钾溶液褪色的有机物

含有碳碳双键、碳碳三键的有机物;苯的同系物的侧链被氧化成羧基;含有羟基、醛基的物质。

(4)反应的数量问题

H2

双键一个三键俩,一见苯环就加三,羧基、酯基、酰胺基不能加

Br2

取代或加成,碳碳双键一个,碳碳三键两个,酚羟基邻对位取代

Na

一羟基一钠

NaOH

卤代烃:一卤一碱,苯环直连最多二;酯:普通酯一、酚酯二;酰胺基、羧基、酚羟基一

4.有机物鉴别的常用试剂:水(是否溶解或分层,密度与水的比较);溴水;酸性高锰酸钾溶液(是否褪色);FeCl3溶液(酚类发生显色反应);银氨溶液、新制Cu(OH)2[醛基或羧基与Cu(OH)2反应];Na、NaOH、NaHCO3碘水(淀粉变蓝);浓硝酸。

(二)教材有机实验

1.乙醇和乙酸的酯化反应

(1)装置

(2)注意事项

试剂的加入顺序,先加入乙醇,然后边振荡试管边慢慢加入浓硫酸和乙酸,再加入几片碎瓷片。

导管末端接近液面而未伸入液面下的目的是防止倒吸

可选用饱和Na2CO3溶液中和乙酸乙酯中的乙酸,溶解乙醇,降低乙酸乙酯的溶解度,然后分液,不选用NaOH溶液是因为会引起酯的水解。

2.乙醇的消去反应

(1)装置

(2)注意事项

应使温度迅速升高到170 

浓硫酸作催化剂。

由于浓H2SO4具有强氧化性,会有副产物SO2产生,挥发出来的乙醇以及SO2均能使酸性KMnO4溶液褪色,应先用NaOH溶液除去乙醇、SO2,再检验是否生成乙烯。

3.溴乙烷的消去反应

(1)装置

(2)注意事项

检验气体产物:先将气体通过装有水的试管,除去挥发出来的乙醇,再将气体通入酸性KMnO4溶液中检验是否生成了乙烯。

现象:酸性KMnO4溶液褪色

注意:若用溴水检验气体产物,则不用先将气体通入盛有水的试管中,因为乙醇不能使溴水褪色,不会对乙烯的检验产生干扰。

4.葡萄糖的还原性实验

(1)银镜反应

实验说明:

实验成功的关键:试管洁净、碱性环境、水浴加热、不能搅拌。

该反应可用于醛基的定性检验和定量测定。

(2)与新制氢氧化铜的反应

实验说明:

通过网盘分享的文件:word讲义【更新联系lymsummers】等2个文件

链接: https://pan.baidu.com/s/1RCL2uLZQuQ-rZUf2_ekrWg?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.000629s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000561s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000255s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000401s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000503s ]
  6. SELECT * FROM `set` [ RunTime:0.002880s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000628s ]
  8. SELECT * FROM `article` WHERE `id` = 462722 LIMIT 1 [ RunTime:0.008616s ]
  9. UPDATE `article` SET `lasttime` = 1774786802 WHERE `id` = 462722 [ RunTime:0.004434s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000279s ]
  11. SELECT * FROM `article` WHERE `id` < 462722 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000492s ]
  12. SELECT * FROM `article` WHERE `id` > 462722 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000380s ]
  13. SELECT * FROM `article` WHERE `id` < 462722 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000844s ]
  14. SELECT * FROM `article` WHERE `id` < 462722 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001680s ]
  15. SELECT * FROM `article` WHERE `id` < 462722 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000815s ]
0.175935s