Question 8:
Phenylethene (C6H5CH=CH2) is the monomer of polystyrene. Phenylethene and
ethene are similar in that they are both
(1) unsaturated compounds.
(2) liquid at room temperature.
(3) capable of polymerization.
A. (1) only
B. (3) only
C. (1) and (3) only
D. All of them
Question 9:
Ethane and ethene can be distinguished by burning them separately because
A. ethene is more likely to give a sooty flame on combustion.
B. ethane is more likely to burn with a luminous on combustion.
C. ethane gives a greater amount of carbon dioxide on combustion.
D. ethene requires a greater amount of oxygen for complete combustion.
Question 11:
The reaction
CH3CH=CH2 + H2SO4 → CH3CHCH3
|
OSO3H
can be classified as
(1) an addition reaction.
(2) a substitution reaction.
(3) a neutralization reaction.
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Question 12:
Which of the following reactions illustrated the additions of alkene?
(1) oxidation of ethene to carbon dioxide and water.
(2) the decolorization of a solution bromine in tetrachloromethane by ethene.
(3) the oxidation of ethene by acidified potassium permanganate.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. All of them
Question 13:
Which of the following compounds is formed when propene is shaken with
bromine in tetrachloromethane?
A. 1,2-dibromopropane
B. 1,3-dibromopropane
C. 1,1-dibromopropane
D. 2,2-dibromopropane
Question 16:
Which of the following statements about cracking of alkane is INCORRECT?
A. It is a chemical change.
B. It is carried out in the absence of oxygen.
C. Unsaturated hydrocarbon(s) is/ are formed.
D. Carbon dioxide is formed.
Question 17:
Which of the following statements about cracking is correct?
A. Plastics are produced by cracking.
B. Alcohols are produced by cracking.
C. Petroleum is produced by cracking.
D. Extra petrol is produced by cracking.
CHEM MC 2
2010-11-20 5:36 am
回答 (1)
2010-11-20 11:41 am
✔ 最佳答案
8. C 土扁 you should read the question more carefully.
1. ethene is CH2=CH2, contains C=C bond, thus is unsaturated; phenylethene is C6H5CH=CH2, which C=C can be found in alkene and benzene ring.
2. ethene is gas.
3. it's phenylethene, NOT poly(phenylethene) or polystyrene. the C=C bond allows it to undergo polymerization.
9. A
it tends to give more sooty flame as C:H ratio increases.
ethane: C2H6, ratio = 1/3;
ethene: C2H4, ratio = 1/2.
11. A
(you should use 全型空格 去做分隔)
1 addition is combination of two or more reactant, giving ONLY ONE product.
2 substitution is combination of two or more reactant, giving MORE THAN one products.
3 neutralization will give salt and water.
12. most appropiate is C
... but it still seems to be strange.
1 more than one products.
2 one product only: n,(n+1)-dibromoalkane is formed.
3 sort of manganese ion or manganese dioxide is formed as well.
13. A
always at adjacent positions.
16. D
this is not burning. also, as no oxygen is let in, while reactants of cracking does not contain oxygen, no (carbon) oxides should be formed.
17. D
should be straight forward.
one of two uses of cracking; another is to produce alkenes, which are important raw materials for syntheses of many useful products, like polythene and Perpex (organic glass, poly(methyl 2-methylethenoate), or PMMA).
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