文档介绍：sketchup导入3dmax技巧(sketchup导入3dmax技巧)
Limited training 18 excel series optimization
A choice (this includes 11 items, each item of 5 points, a total of 55 points, each item is only one option right)
1. ethyl acetate was prepared with acetic acid, ethanol and concentrated sulfuric acid in the laboratory. After heating and distillation, colorless oil like liquid was obtained on the saturated sodium carbonate solution, and the oscillation mixture produced bubbles
In the A. product, the sulfuric acid B. is distilled and some unreacted ethanol is distilled
C. partially reacted with acetic acid and partially reacted with concentrated sulfuric acid to be distilled from D.
Analysis: when the ethyl acetate is prepared, some unreacted acetic acid is distilled, and acetic acid and sodium carbonate react to form carbon dioxide gas.
Answer: C
2., there is a kind of aliphatic alcohol, which can be obtained through a series of reactions. This alcohol can be prepared by oxidation, esterification and polymerization reaction
==CH2OH
Analysis: this problem is mainly to find polymer monomer, the
main chain is all carbon atoms, so monomer should be in the form of ethylene, that is, the form of ethylene
CH2==CH - COOCH2CH==CH2, this monomer is obtained by oxidation and esterification of fatty alcohols, so only the B option meets, and the other options must be eliminated.
Answer: B
3. compound C can be obtained by the following reactions:. The structural simplicity of C can not be ()
(CH2Br) 2 B. (CH3) 2CBrCH2Br
(CHBr) 2CH3
Analysis: this question mainly examines the mechanism of olefin and bromine addition reaction, addition reaction according to the principle: a broken two, where, where plus. Olefin and bromine production after addition reaction must be consistent with the two carbon atoms connected with bromine atoms must be directly connected. A two is connected with the bromine atom carbon atoms are not directly conn