How to learn organic chemistry well, how to learn chemistry organic

Isomers are a difficult problem for many high school students to learn chemistry. If you stand in the perspective of the college entrance examination, you just need to learn to judge well and simply write isomers from the molecular formula.

One: Judgment. Just grasp the two points of isomorphism and heterogeneity. The misconception is that some students think that the same substance is also isomerized.

Two: Write isomers.

1) Master several phenomena of isomerism: 1 carbon chain isomerism 2 position isomerism 3 functional group isomerism.

2) Steps of standard writing: functional group isomerism--- positional isomerism--- carbon chain isomerism. It ensures that there are no missing writes.

Of course, it seems relatively simple to say, but it still takes some effort to learn it well, and in the process of learning organic chemistry, spatial imagination and the structure and properties of functional groups are all necessary.

Answer]: From two aspects, category heterogeneity and structural heterogeneity.

Category Heterogeneity]:

1. Alkenes and naphthenic hydrocarbons CNH2N(N3).

2. Alkynes and diolefins CNH2N-2(N 4).

3. Saturated monools and ethers CNH2N+2O(N3)4, saturated monoaldehydes and ketones CNH2NO(N3).

5. Saturated monocarboxylic acids and esters CNH2NO2 (N 2) 6, phenol homologues, aromatic alcohols, aromatic ethers CNH2N-6O(N 7) 7, amino acids and nitro compounds CNH2N + 1O2N (N 2) structural isomerism] including the isomerism of the number of carbon atoms in the backbone and the isomerism of the position of the branch chain, it is easy to count the number by drawing the structure diagram, it is recommended to start with the isomerism of the number of carbon atoms in the main chain, and then draw the isomerism of the position of the branch chain on this basis, so that it will not be lost.

1. Understand and master the properties of each functional group (including physical properties and chemical properties), remember their characteristic reactions, and be able to immediately say what reaction can occur and under what conditions it can react as soon as you see what functional group.

2. Focus on the main organic chemical reaction equations such as addition, esterification, and elimination reaction.

3. Pay attention to the reaction between alkene (alkyne) - alcohol - aldehyde (ketone) - ester, which must be the test point of the last inference question (in addition, it may also involve peptide bonds).

4. Chemistry is a science subject between physics and biology, it must do a certain amount of topics, you can buy some special topics, sets of questions to do, strengthen understanding and application.

5. On the basis of understanding the textbook, you must do other topics, sets of questions and other questions. That's going to be a sacrifice for the end.