真四第張五第2日八初月 四年丑癸歷夏
WAH KIU YAT PO
報日僑華
1973英文中學會考試題預習專欄。
JAM X IPADE VA
化學科
Halogemation
acetic acid.
(廿九)
illustrated by
If anhydrous acetic acid is boiled under reflux and dry chlorine is passed in, it gives in succession, mono, di, and trichloroacetic acids. The reaction is catalysed by sulphur and by sunlight.
CH COOH + C1→→→HC1 + CH C1000H
CH2 C1000H + 011⁄2 ► HC1 + CHC1, COOH CHC1 ) COOH + C1 HCl + 001 13COOH
The strength of the acid increases as the number of chlory ine atoms in the molecule increase
Trichloroacetic acid is one of the strongest acids known.
Exercise
Part
1. Which methods are suitable for
the preparation of primary alcohols?
I. Hydrolysis of a primary
alkyl iodide
II. Hydrolysis of a secondary
alkyl bromide
T. Hydrolysis of: an ester of a
primary alcohol
IV. Reduction of an acid using
sodium and alcohol
Hydrolysis of an acyl chloride
IT only
III only
II, III only
D. II, V. only
E. III, IV only
2. Which statements are correct concerning the reactions bet tween ethanol and inorganic.. acids?
I. Ethanol can form the ester
ethyl hydrogen sulphate. II. Excess ethanol warmed with conc. sulphuric acid gives. diethyl ether.
Ethanol warmed with excess conc. sulphuric acid gives: ethylene.
IV. Ethanol can be dehydrated.
using hot syrupy phosphoric acid.
Bethanol refluxed with:
excess cone. hydriodic acid gives ethyl iodide.
A. I, II, III only B. II, III, IV only C. II, IV, V only
D. III, IV, V only E. All
A liquid suspected of being an
: alcohol had a small piece of
sodium added.
Hydrogen gas
was liberated.
could
have been:
A. ethyl alcohol
The Liquid:
B. any liquid alcohol C.amixture of water and a
miscible alcohol:
D. water
E. any of the above
A carboxylic acid forms a methyl ester of molecular
formula C HO
4¥802. The acid is
A. formic acid
B. acetic acid
C. propionic acid-
oxalic acid::
1. butyric acid
日十月五年三七九一圈公年二十六國民華中育教養華
四期星
In the homologous series of simple aliphatic alcohols:
A. the homologous decrease in solubility as the chain. length increases.
B.
the highest homologous are gaseous CE
C. the lowest homologous are
gaseous
D. the boiling points decrease
as the chain length increases E. the vapour density decreases
as the chain length increased
The equation ROHR COOH-
is typical of
RCOOR'
P. dehydration of an alcohol Q. neutralization of an alcohol
H. hydrolysis of an alcohol S. the interaction of an
aldehyde and an acid T.ester formation:
When phosphorus pentachloride is added to acetic acid,
P. chlorocuetic acid will be
·formed..
Q. acetyl chloride will be form-
ed.
ethyl chloride, phosphorous. oxychloride and hydrogen. chloride will be formed. an addition reaction will occurr
T. no reaction will occur.
8. If methyl alcohol is allowed
to react with acidified
potassium permanganate, it will be oxidized to:
P. Formaldehyde.
Q. Formic acid
R. Carbon monoxide
S. Carbon dioxide
T. Carbon dioxide and water
9. Esterification and neutralizat-
ion differ in
I. reaction rate
II. reversibility
III. nature of reaction
Which of the following alternat -ives is correct?.
P. I & II only Q.I & III only R. II & III only S. I, II & III
I. None of the above.
10. The concentration of ester in
the equilibrium mixture formed by reacting a carboxylic acid with an alcohol would remain the same on adding
P. more carboxylic acid Q. a suitable catalyst
more al choy:
S. concentrated
1 water
Part II
alphuric acid
1. a) When 6.9 grams of an inflamin
-able organic compound X
were:
annt in excess oxygen,
13.2.
of carbon dioxide. grams of water were obtained as the only product -s. From this calculate the empirical formula of X.
b) By means of a series of
equations show how:
i) Ethyl alcohol is convert-
ed into acetic acid.. ii) Methyl acetate is obtain-
ed from methyl alcohol State the conditions under which the reactions: take place.
c):Compare and name the product
ws formed by the action of phosphorus pentachloride on
ethanol and acetic acid.
風作的
ROBERT BOLTS F LADY CAROLINE
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折八者赠期長
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迎票:
週第 映三
場今 【献天 映四
百華新
結語大效收廉用費
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