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Q. Give examples for allylic halides.
Answer:- The halogen atom is bound to an sp3 hybridised carbon atom close to the carbon-carbon double bond (C=C) in allylic halides. An allylic halide, for example, is CH3CH = CHCH2Cl. Sn1 and Sn2 mechanisms both react with such halides.
Important terms to know:
Halides: When halogens are connected to the carbon chain, they are referred to as halides. The allylic carbon atom is an sp3 hybridised carbon atom that is coupled to a sp2 hybridised or double-bonded carbon atom in the chain.
In organic chemistry, there are many different forms of carbon chains, such as straight-chain, branched-chain, allylic carbon chain, vinylic carbon chain, and so on. When the carbon atoms form a double or triple bond, they are given other names.
As a result, we’re provided allylic halides, which refers to the halogens when they’re connected to the carbon chain. The allylic carbon atom is an sp3 hybridised carbon atom that is coupled to a sp2 hybridised or double-bonded carbon atom in the chain. Fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) are all halides (I).
When the last carbon atom in a chain is connected to a carbon atom with a double bond, and the last carbon atom has one substituent halogen, the halide is called an allylic halide.
A sp2 hybridised carbon atom is bonded to the carbon atom with the bromine atom. Other examples are:
CH3-CH2-CH2-CH = CH- CH2Cl
