- Polyhalogen Compounds – Dichloromethane, Trichloromethane, Tetrachloromethane, Iodoform, Freons, DDT. …
- 1.Dichloromethane. …
- Trichloromethane (Chloroform) …
- Tetrachloromethane (Carbon Tetrachloride) …
- Iodoform. …
- Freons (CFCs) …
- DDT (p, p’-Dichlorodiphenyltrichloroethane)
What are Polyhalogen derivatives?
Classification on the basis of number of halogen atoms
Mono halogen derivative compounds contain only one halogen atom. Dihalogen derivative compounds contain two halogen atoms. If a halogen derivative compound contains more than two halogen atoms, it is called a polyhalogen derivative.
Which of the following Polyhalogen compounds is useful in extinguishing fires?
Which of the following polyhalogen compounds in useful in extinguishing fires? Clarification: Carbon tetrachloride is used as a cleaning fluid, degreasing agent, spot remover and a fire extinguisher.
Are Haloalkanes aromatic?
The key difference between haloalkanes and haloarenes is that haloalkanes are aliphatic compounds containing halogens, whereas haloarenes are aromatic compounds containing halogens. Furthermore, haloalkanes have no aromatic rings, but haloarenes have.
How are Haloalkanes classified?
Ans: Haloalkanes are classified as primary (1∘), secondary (2∘), and tertiary (3∘) haloalkanes based on which carbon atom is bonded to the halide group. In all these types, the carbon atom is sp3 hybridised.
Is the example of Haloarene?
Chlorobenzene, bromobenzene etc. are examples of haloarenes. Number of halogen atom/s on an alkyl or aryl halide molecule.
Which is Polyhalogenated compound?
Polyhalogenated compounds (PHCs) are any compounds with multiple substitutions of halogens. … PBDEs, PCBs, dioxins (PCDDs) and PFCs are all polyhalogenated compounds. They are generally non-miscible in organic solvents or water, but miscible in some hydrocarbons from which they often derive.
What are Polyhalides explain with examples?
a chemical compound of metal halides and halogens. Polyhalides containing bromine (polybromides) and iodine (polyiodides) are known—for example, potassium triio-dide, KI3; cesium pentabromide, CsBr5; and potassium enneaiodide, KI9. Polybromides and polyiodides dissociate into ions in aqueous solutions.
What are freons give one example?
The family of refrigerant gases. Nowadays, freons are more widely described as substituted hydrocarbons, where a number of, or all, hydrogen atoms are exchanged for fluorine, chlorine or (more rarely) bromine. … Two examples from this large family are Dichlorodifluoromethane (R-12) and Tetrafluoroethane (R-134a).
How is DDT harmful to the environment?
DDT is very insoluble in water and very persistent in the environment, making it a highly polluting hazard. … Due to it’s low solubility, it has a greater rate of bioaccumulation in water, and thus poses a great long-term threat to aquatic wildlife.
What is DDT pollutant?
DDT is an organochlorine insecticide. It was synthesized in the late 1870s and discovered as an insecticide in late 1930. … DDT is readily absorbed into soil and adsorbed onto sediment and is therefore known as a persistent organic pollutant (POP), meaning it is resistant to environmental degradation.
Which is the first chlorinated organic insecticide?
The chlorinated hydrocarbons were developed beginning in the 1940s after the discovery (1939) of the insecticidal properties of DDT. Other examples of this series are BHC, lindane, Chlorobenzilate, methoxychlor, and the cyclodienes (which include aldrin, dieldrin, chlordane, heptachlor, and endrin).
What are uses of DDT?
Between the 1950s and the 1980s, DDT was widely used in the agricultural industry as an insecticide. The use of DDT to control diseases like typhus and malaria was not uncommon in the early 1940s. DDT acts upon the sodium ion channels in the neurons of insects, making them fire in a spontaneous manner.
What are Polyhalides explain it?
: a halide containing more than one halogen atom in a molecule.
What are Pseudohalogens explain?
Pseudohalogens are polyatomic analogues of halogens, whose chemistry, resembling that of the true halogens, allows them to substitute for halogens in several classes of chemical compounds. … Well-known pseudohalogen functional groups include cyanide, cyanate, thiocyanate, and azide.
Are Interhalogen compounds?
An interhalogen compound is a molecule which contains two or more different halogen atoms (fluorine, chlorine, bromine, iodine, or astatine) and no atoms of elements from any other group. Most interhalogen compounds known are binary (composed of only two distinct elements).
What are Polyhaloalkanes?
Filters. (chemistry) Any of very many aliphatic organic compounds derived from a hydrocarbon by the replacement of two or more hydrogen atoms with those of a halogen. noun.
What is DDT 12?
DDT is a colourless, tasteless (at standard conditions for temperature and pressure, STP) and almost odourless organochlorine. … The solubility of dichlorodiphenyltrichloroethane in water corresponds to 25 micrograms per litre. Note: DDT is the first chlorinated organic insecticide which was prepared in 1873.
How many types of haloalkanes are there?
Halogenoalkanes are also called haloalkanes or alkyl halides. All halogenoalkanes contain a halogen atom – fluorine, chlorine, bromine or iodine – attached to an alkyl group. There are three different kinds of halogenoalkanes: Primary, secondary and tertiary.
What is the general formula of Haloarenes?
Define Haloarenes
They are also referred to as aryl halide. Haloarenes are obtained when a halogen atom replaces a hydrogen atom attached to an aromatic ring. For example, The General formula for haloarene is Ar–X, where Ar represents an aryl group and X is a halogen atom.
What are primary haloalkanes?
A primary halogenoalkane has the halogen bonded to a carbon, which is itself only attached to one other carbon atom. A secondary halogenoalkane has the halogen bonded to a carbon that is itself attached to two other carbon atoms. … This is a useful reaction for increasing the chain length by one carbon atom.