A is an organic compound containing three elements: carbon, hydrogen and oxygen, and it is known tha

A has a relative molecular mass of 144, where the mass fraction of carbon is 50%, c = 144 1 2 = 72

There are 6 c atoms, 1 molecule A hydrolyzed to obtain B and 2 molecules of methanol, A is an ester.

The ratio of the number of carbon, hydrogen and oxygen yards in b is 1:1:1, there are no branched chains in the molecule, and there are 2 carboxyl groups.

It can react with sodium hydroxide and can fade bromine water. There is c=cb:hooc-ch=ch-cooh

A: CH3-OOC-CH=CH-CoO-CH3A can occur in the reaction that can occur 4 oxidation (combustion) addition, addition and polymerization.

The name of the functional group contained in the B molecule is the carboxyl group, the carbon-carbon double bond.

b Structural shortening of isomers with the same functional groups.

Hooc-C=CH2 (carboxyl group under carbon).

The chemical equation for COOHB to produce a is.

2CH3OH + HOOC-CH=CH-COOH== concentrated sulfuric acid, heating ==CH3-OOC-CH=CH-COO-CH3+2H2O

Jia Cun made a mistake, right? Should it be methanol? If it's methanol, it's all gone.

First, according to the molecular weight of 144 and the carbon mass fraction of 50%, the number of c atoms in a molecule is obtained 144 * 50% 12 = 6, and then the molecules containing carbon, hydrogen and oxygen are insoluble in water, and can be hydrolyzed into a molecule b and 2 molecules of alcohol under acidic conditions, which is the property of esters.

It is preliminarily inferred that A is an ester, and B is a certain carboxylic acid, and it is a dibasic carboxylic acid, which can esterify with two molecules of methanol.

A contains 6 carbon atoms and two methanol contains 2 carbon atoms, so B should contain 4 carbon atoms. The ratio of the number of atoms in b is 1:1:1, so the molecular formula b is c4h4o4.

As mentioned above, B contains two carboxylic acid groups, and there are no branched chains in the B molecule, while the carboxylic acid group-COOH can only be located at both ends of the molecular formula. Therefore, the simple formula of the structure of the B molecule should be Hooc—CH=CH—Cooh, 4 carbon, 4 hydrogen, and 4 oxygen.

According to the characteristics of the esterification reaction, we can deduce the simple structure of a as.

ch3oco—ch=ch—cooch3。

Answer: (1) Because of the presence of double bonds, A can undergo addition, polyaddition, and oxidation reactions.

2) The functional group contained in b is c=c double bond and carboxyl group.

3) CH2=C(Cooh)2, isomers can put two carboxyl groups on the same C atom.

4) Hooc—CH=CH—COOH+2CH3OH—(H2SO4 catalysis) CH3OCO—CH=CH—Cooch3+2H2O

Because: a has a relative molecular mass of 144, where the mass fraction of carbon is 50%, assuming that there are n carbon atoms in a, then the mass fraction of carbon in a = 12n 144 = 50%.

So n=6,a+ m h20---b+2ch3oh according to the law of atomic equilibrium: b contains 4 carbon atoms, and because the ratio of the number of carbon-hydroxy-oxygen yards in b is 1:1:1, b is c4h4o4

b can react with sodium hydroxide, indicating that there is a carboxyl group, which can fade bromine water, indicating that there is a double construction.

There are no branched chains in the molecule, so b is hooc-ch=ch-cooh

Solution: Each molecule of the organic substance contains hydrogen atoms (118 Because the number of carbon atoms in the molecule is twice that of hydrogen, the number of carbon atoms in each molecule of the organic matter is 10 2 = 5

12 5 + 1 10 = 70 118, so the molecule contains oxygen atoms, and each organic molecule contains oxygen atoms (118-70) 16 = 3, so the molecular formula of the organic substance is C5H10O3

You should be wrong in this question, it should be that the hydrogen atom is twice the number of carbon atoms, in this case the molecular formula should be C5H10O3

The number of carbon atoms in a molecule is twice that of hydrogen.

It can't be.

An organic compound is made of carbon only.

Hydrogen. Oxygen is composed of three elements, and its relative molecular mass is less than 150, if it is known that the mass crude swimming fraction of oxygen is 50%, how many carbon atoms are in the molecule?

The relative molecular mass of a is 144, where the mass fraction of carbon is 50%, then the number of carbon atoms in a = 144 50%.

6, A can make bromine water fade, indicating that A contains unsaturated bonds, A is insoluble in water, but hydrolysis reaction can occur under acidic conditions, B and methanol are obtained, indicating that A is an ester B is carboxylic acid, the number of carbon atoms in B is less than 6, the ratio of the number of carbon, hydrogen and oxygen atoms in B is 1:1:1, there is no branched chain in the molecule, and it can react with sodium hydroxide solution, then B can only be Hoocch=CHCOOH, A is CH3

oocch=chcooch3

1) The structure of A is simply as follows: CH3

oocch=chcooch3, A contains ester groups and carbon-carbon double bonds, so A can undergo addition reaction, polyaddition reaction and oxidation reaction, so it is selected

2) The structure of B is simply as follows: Hoocch=CHCOOH, then the name of the functional group in B is carbon-carbon double bond and carboxyl group, so the answer is: carbon-carbon double bond and carboxyl group;

3) The structure of B is as follows: Hoocch=CHCOOH, and the structure of isomers with the same functional groups as B is: HoocCH=CHCOOH, CH2

c(cooh)2, so the answer is: hoocch=chcooh, ch2

c（cooh）2

4) Under the condition of concentrated sulfuric acid as catalyst and heating, B and methanol undergo esterification reaction, and the reaction equation is: <> so the answer is: <>

C 12 has 4 bonds, O 16 has 2 bonds, and H 1 has 1 bond. C and O can have double bonds i.e. C=O, and a C=O molecular weight is 28

Two are 56, two c=o can be connected, one hydroxyl group is 17, and the addition of an h is just 74. So the answer is 2 h

The minimum of two is o = c - c = o

h o - h

ohc-cooh）

It is called: glyoxylic acid, which has the properties of aldehydes and acids, which can be oxidized to adipic acid and can be reduced to glyoxal, ethylene glycol, etc.

The sample is, the water is generated, that is, the weight is the mass of carbon dioxide, so the substance contains h, is, carbon is, the remainder is oxygen, and the mass is, i.e., so the substance in c:h:o=1:

2:1, and the relative molecular mass of the compound is 90, so the molecular formula of the compound can be deduced as C3H6O3

It is known that o%=

Then the ratio of the number of atoms of c:h:o is the number of atoms :

The same number is quickly divided by the smallest number.

Reduced to a whole simple number = 5: 12:4

c5h12o4

First of all, assuming that its relative molecular mass is 150, the mass fraction of oxygen is 50%, so the number of oxygen atoms cannot exceed 4, m (organic compound) = 64 50% = 128

The sum of the relative atomic masses of hydrocarbon elements = 128-16 * 4 = 64 The number of carbon atoms can be up to 5 and the number of hydrogen atoms can be up to 4