Chemistry textbook examples about benzene are explained in the first year of high school.

1) Both carbon-carbon single bonds and carbon-carbon double bonds can be oxidized by the acidic potassium permanganate solution, and can also fade bromine water, while benzene cannot, indicating that there is no alternating structure of carbon-carbon single bond and carbon-carbon double bond in benzene molecule.

2) Benzene is an organic matter, insoluble in aqueous solution, there will be delamination, and the lower layer is potassium permanganate solution, so it is purple.

Benzene is actually a large bond of 6 centers and 6 electrons.

1. If there is a structure of alternating carbon-carbon single bonds and carbon-carbon double bonds, the bromine water will fade or be oxidized by the acidic potassium permanganate solution.

2. Benzene is less dense than water and insoluble in water, so it will be layered after adding acidic potassium permanganate solution, and the lower layer is purple.

Because you are in high school, you don't know the structure of benzene yet, so to say that, in order for you to understand, you just have to remember, because you don't need to verify, 2, benzene can't be compatible with potassium permanganate in the upper layer, and the density of benzene is less than that of potassium permanganate, so it's in the upper layer. You don't understand the structure here, and it's not a sentence and a half that can explain it, if you like chemistry and go to college to apply for a chemistry major, you will understand.

1 It's hard to explain this, but you don't need to know so much about the fact that the stupid molecule electron cloud is delocalized and forms stable large bonds, which are more stable than small bonds that alternate between single and double bonds.

2. This is similar to extraction, benzene is relatively light, so it is in the upper layer.

1.There is only one o-dibenzene of benzene (which can be o-dibromobenzene, o-dichlorobenzene,)2Benzene cannot discolor acidic potassium permanganate (ethylene can discolor acidic potassium permanganate because of the functional group of carbon-carbon double bonds).

3.Benzene cannot discolor the carbon tetrachloride solution of bromine due to a chemical reaction.

4.The carbon-carbon bonds in the benzene molecule are exactly the same.

In a substance, the length of the single bond and the double bond are not the same, because the bond length of the single bond and the double bond are not the same, because the bond length of the single bond and the double bond are different, which means that it is a bond, and benzene can be added and substituted, which is the two bonds.

The chemical equations related to benzene in the third year of high school are as follows:

Substitution reaction of benzene and bromine:

Substitution reaction of benzene and concentrated nitric acid:

Addition reaction of benzene and hydrogen:

The benzene ring is the simplest aromatic ring, which consists of six carbon atoms to form a six-membered ring, each carbon atom is connected to a group, and the 6 groups of benzene are all hydrogen atoms.

However, experiments have shown that benzene cannot discolor bromine water or acidic KMno4, which indicates that there is no carbon-carbon double bond in benzene. It has been proved that the carbon atoms on the benzene ring backbone are not arranged by single and double bonds as previously known (proposed by Kekule), and that the bonds between every two carbon atoms are the same, and are connected by a bond that is neither double nor single (major bond).

Correct solution: c

Analysis: aUnder the condition of Febr3(Fe) as a catalyst, benzene undergoes a substitution reaction with liquid bromine to form bromobenzene.

b.The acidic potassium permanganate solution cannot oxidize benzene, so the solution is layered, the upper layer is benzene, and the lower layer is purple potassium permanganate solution.

c.Benzene extracts bromine from bromine water, which is less dense than water, so the upper liquid is orange dBenzene can undergo an addition reaction with chlorine to form hexachlorobenzene.

Answer C, a Benzene is replaced by liquid bromine (liquid bromine must be liquid bromine) catalyzed by Febr3 (equation in the book).

b benzene can not make the acidic potassium permanganate solution fade, benzene density is small, floating layer. Underlying potassium permanganate solution, purple.

c。Benzene does not react with bromine water, but there is an extraction process (physical change). Benzene is in the upper layer, water is in the lower layer, and bromine will enter the benzene layer from the water, and the upper layer is orange. (Bromine and iodine are soluble in organic solvents).

d。Benzene is added with hydrogen catalyzed by nickel. In fact, it can also be added with chlorine.

A Yes, the substitution reaction occurs with ferric bromide as a catalyst.

b Yes, benzene cannot fade the acidic potassium permanganate.

C false, benzene is lighter than water and should be in the upper layer.

D pair, an addition reaction can occur to generate pesticide 666, i.e., C6H6Cl6

a Correct Under the catalysis of ferric bromide, it can have a substitution reaction with liquid bromine b Correct Potassium permanganate does not fade when exposed to benzene, and the density is greater than benzene, in the lower layer of the solution c False The upper layer should be orange The lower layer is colorless d Correct Under the action of the catalyst, 1mol of benzene can react with 3mol of chlorine to form "666 (a pesticide originally commonly used)".

C should be chosen for this question. Monosubstitution means that there is only one substituent on the benzene ring, that is, there is only one side chain. The molecular formula of this compound is C10H14, and since this compound contains a benzene ring, then the molecular formula can be written as C6H5-C4H9, and the side chain part is a butyl group.

There are a total of 4 structures of butyl, so there should be 4 structures of its monosubstituted aromatic hydrocarbons.

Mono-substituted aromatic hydrocarbons.

Alone means one.

Substitution alone is the substitution of only one hydrogen.

Aromatic hydrocarbons, usually referred to hydrocarbons that contain a benzene ring structure in their molecules. It is a type of closed-chain class and has the basic structure of benzene ring.

c10h14

Obviously, there is only one benzene ring, and because it is monosubstituted, the benzene ring has one side chain and one less hydrogen (C6H5).

So that's left c4h9, and then you can get the answer by arranging this chain.

First of all, there is only one substituent in single substitution, and the molecular formula of the benzene ring is C6H5, and the molecular formula of the remaining group is C4H9, indicating that the substituent is a saturated alkane, so the structure of this molecule is the structure number of C4H9, there are straight chain type and a branched chain type, and then each chain type has 2 kinds of positions of benzene rings, so there are a total of 4 bells.

Singular substitution means that only one is replaced. That is, the original hydrogen atom on the benzene ring is replaced by a group, and the single substitution = only one is replaced, is there anything that cannot be understood.

Monosubstitution means that there is a substituent group, and an H on the benzene ring is replaced by a group, and then this group has a total of four different chain structures.

(1) There is a side chain on the benzene ring: C10H14 ==> C6H5-C4H9!

2)-C4H9 butyl has 4 isomers (n-butyl, sec-butyl, isobutyl, tert-butyl)!

3) There are 4 isomers with one side chain on the C10H14 benzene ring!

Single substitution means that one hydrogen on the benzene ring is replaced by a substituent, and multiple substitutions means that multiple benzene rings are easily replaced by electrophiles.

Monosubstituted aromatic hydrocarbons indicate that there is only one substituent on the benzene ring.

The meaning of the single Chinese word is one, and the single substitution refers to one.

substituents, the core of which becomes not to examine benzene.

The substitution position of the ring only tests your knowledge of the substituent type.

Got it. If it is not replaced by a single order, it will be divided into doubles

Three, four, substitution, and so on to find isomers, and this is not only.

The position is easy to buy structure, and there are substituent isomerism.

The molecular formula is C10H14, monosubstituted aromatic hydrocarbon, indicating that there is a benzene ring and a substituent in the molecule, so it is a phenyl C6H5-linked alkyl group C4H9. Whereas, the hydrocarbon group C4H9- has four structures, and the phenyl group has only one structure, so this organic substance has four structures.

Monosubstituted aromatic hydrocarbons are monovariants that have a substituent on the benzene ring. This is a customary way of saying.

Suppose that Cl means that there is an H replaced by Cl.

1. Yes; 2. There is the nature of aldehyde group, and when writing functional groups, write ester group 3.

1. Definition Benzene homologues refer to cyclic hydrocarbons that contain a benzene ring in the molecule and constitute a cyclic hydrocarbon conforming to CNH2N-6(N6). The presence of a benzene ring in the molecule indicates that the structure is similar, and the composition conforms to CNH2N-6 indicates that the composition is different by one or several CH2 atomic clusters, and only a series of hydrocarbons that meet these two points are benzene homologues. 2. Nature 1 Two effects (1) The side chain affects the benzene ring.

The hydrogen atoms on the ortho and para positions of the benzene ring are active and easily replaced by other atoms or clusters. (2) The benzene ring affects the side chain. The hydrogen atom on the carbon atom directly connected to the benzene ring is active and easy to be oxidized, and the oxidation product is benzoic acid regardless of the length of the side chain.

For example, toluene and ethylbenzene can fade the acidic potassium permanganate solution. 2 Two substitutions Toluene and bromine can undergo substitution reactions, but under different conditions and in different positions. (1) occurs on the benzene ring, that is, the effect of the side chain on the benzene ring.

2) Substitution reactions that occur on the side chains, i.e., alkanes-like, can continue. 3 Two kinds of fading (1) The homologues of benzene cannot discolor bromine water (do not react), but can fade bromine water layer (physical properties). 2) Benzene congeners can discolor acidic potassium permanganate solutions.

Organic compounds that contain benzene rings in their molecules are called aromatic compounds. It includes aromatic hydrocarbons and their derivatives, such as halogenated aromatic hydrocarbons, aromatic nitro compounds, aromatic alcohols, aromatic acids, etc. Aromatic hydrocarbons, abbreviated as "aromatic hydrocarbons", usually refer to hydrocarbons that contain a benzene ring structure in their molecules.

It is a type of closed-chain class. It has the basic structure of benzene ring, and most of these compounds discovered in the early history have aromatic channels, so these hydrocarbons are called aromatic hydrocarbons, and the hydrocarbons that are not aromatic odors discovered later also follow this name. For example, benzene, naphthalene, etc.

The general formula of the homologue of benzene is CNH2N-6 (N 6).

"Aromatic compound j is all compounds that contain benzene rings, and aromatic hydrocarbons are a class of aromatic compounds, which are hydrocarbons and can have one or more benzene rings. The homologues of benzene are hydrocarbons with benzene plus CNH2N structure.