Cyclohexene and cyclopropylene are not homologues

Cyclohexene and cyclopropylene belong to cyclic olefins, and the molecular formula difference C3H6 strictly meets the definition, so they are homologues.

Definition of homologues: In general, we refer to organic compounds with similar structures and several different molecular compositions of "CH2" atomic clusters as homologues. Homologues generally occur in organic chemistry, and the homologues must be of the same class (containing the same and equal number of functional groups, with the exception of hydroxyl groups, phenols and alcohols cannot be homologs, such as phenol and benzyl alcohol).

Note: Most of the homologues differ by 1 or n methylene groups, but there are exceptions (in the case of exams, it is usually informational).

Substances with the same group are not necessarily homologues (e.g., alcohols and phenols, aldehydes, ketones and acyls, etc.).

Propylene and cyclopropylene are not homologues.

The structure is similar, and the molecular composition is different"ch₂"The organic compounds of the atomic clusters are called homologues to each other. Obviously, propylene C H6 and cyclopropylene C H do not meet this definition.

Yes, the same kind of substance, the molecular formula difference is n ch2

Propane, cyclopropane, and propylene are all organic compounds that are made up of carbon and hydrogen and differ in their molecular structures and can be distinguished by:

1.Reactivity difference: Propane is a saturated hydrocarbon and is not reactive; Cyclopropane is more reactive than propane due to the tension present in its molecules and is prone to chemical reactions; Propylene is an unsaturated hydrocarbon that has high reactivity and is prone to addition reactions, etc.

2.Physical property differences: The physical properties of propane, cyclopropane, and propylene are different. For example, they have different boiling points and densities, and they can be distinguished by detecting these physical properties.

3.Molecular structure differences: Propane and cyclopropane are both chain-like molecules composed of three carbon atoms and several hydrogen atoms, while propylene is an unsaturated hydrocarbon molecule composed of two carbon atoms and two hydrogen atoms, so their molecular structures are different, and they can be distinguished by detecting the molecular structure.

In summary, propane, cyclopropane, and propylene can be distinguished by a variety of methods such as reactivity, physical properties, and molecular structure.

It is used for the preservation of self-produced ethylene or ethylene-sensitive fruits, vegetables and flowers.

It can well delay the maturity and aging, maintain the hardness and brittleness of the product, maintain the color, flavor, fragrance and nutrients, effectively maintain the disease resistance of the plant, reduce the decay caused by microorganisms and alleviate physiological diseases, and can reduce water evaporation and prevent wilting. The following fruits, vegetables and flowers are treated with this product, and the shelf life is greatly extended. The following is the role of 1-methylcyclopropene in apples and kiwifruit.

Draw a triangle and add a double bond to it, and then the 2 methyl group is on the carbon with 2 hydrogen atoms, that is, not on the double bond carbon.

Here's how to distinguish it:

1. Add acidic potassium permanganate solution, which will fade to cyclohexene. Potassium permanganate can oxidize cyclohexene, but not cyclohexane and benzene, and potassium permanganate can oxidize the C=C bond, but not the C-C bond and the carbon bond in this ring.

2. Add concentrated nitric acid and concentrated sulfuric acid for nitrification reaction, and if there is an oily liquid (nitrobenzene) with bitter almond gas, benzene is generated.

3. What has not reacted in the above two steps is cyclohexane.

The molecular formulas of 1,2-cyclohexene and 1-methyl-3-cyclohexene are the same, but their structures are different, so they can be distinguished by different characteristics.

A commonly used method of differentiation is by nuclear magnetic resonance hydrogen spectroscopy (NMR) spectroscopy. In the NMR spectrum of 1,2-cyclohexene, two methylene proton signals with similar chemical shifts will appear, while in the 1-methyl-3-cyclohexene NMR spectrum, only one methylene proton signal will appear. Therefore, the two compounds can be distinguished by looking at the number and location of methylene protons in the NMR spectrum.

Another way to distinguish is by the reactive nature of the compound. Since the steric hindrance of the two methylene groups in 1,2-cyclohexene is smaller, it is more prone to addition than 1-methylene-3-cyclohexene. For example, 1,2-cyclohexene can undergo addition reactions with hydrogen, hydrochloric acid, etc., while 1-methyl-3-cyclohexene does not.

The distinction between 1,2-cyclohexene and 1-methylene-3-cyclohexene can also be performed by NMR spectra and reaction properties. In the chain-carrying NMR spectrum of 1,2-cyclohexene, the chemical shift of methylene protons is smaller, while in the NMR spectrum of 1-methylene-3-cyclohexene, the chemical shift of methylene protons is larger. In addition, 1,2-cyclohexene is more likely to undergo cycloaddition reactions than 1-methylene-3-cyclohexene and can undergo addition reactions with bromine, while 1-methylene-3-cyclohexene does not.

3 All right. It should be called 4-ethylcyclohexene because the numbering convention for organic compounds starts from the proximity to the functional group, and for cyclohexene numbering from the end of the double bond. Therefore, it should be called 4-ethylcyclohexene. As shown in Fig.