Elimination reactions are organic reactions where two substituents are removed from a molecule, often in the presence of acidic or basic conditions, to create unsaturated compounds. The process involves three steps: proton removal, formation of a pi bond, and breaking of the leaving group bond. There are two main types of elimination reactions: E1 (unimolecular) which involves an intermediate, and E2 (bimolecular) which occurs in a single step.

1. ORGANIC CHEMISTRY
PREPARED BY:
FARHAN AHMAD

2. What are elimination reactions? Discuss in
detail.

3. Elimination reactions:
 The elimination reaction is an organic reaction in which two
substituents are removed from a molecule to form a new product.
 This process takes place in the presence of acid, base, metal and
sometimes through heating.
 Through this process it is possible to synthesize unsaturated organic
compounds from saturated ones.
 The elimination is mechanically the reverse of the addition reaction.

4. Steps involves in elimination reactions:
The elimination reaction involves three fundamental steps:
 Removal of proton
 Formation of C=C pi bond
 Breaking of the bond to leaving group.2

5. Nomenclatures used in elimination reaction:
 When a hydrogen atom is removed from the compound as a proton,
the process is called deprotonation.
 If a halogen is removed then it is called dehalogenation.
 If both hydrogen and halogen are removed, then it is called
dehydrohalogenation.
 If hydrogen and oxygen are removed together, as in the case of
alcohols, then it is a dehydration or β-Elimination.

6. Types of Elimination Reaction:
There are two types of elimination reaction:
E1 type
E2 type

7. E1 Type:
Two step removal mechanism process.
Also known as unimolecular elimination.
Formation of an intermediate.
The reaction rate is proportional to the cocentration of the
compound to be transformed( First order Kinetics)

8. E2 Types:
One step Mechanism
Also known as Bimolecular reaction
Carbon leaving group and carbon hydrogen bonds break
off simultaneously
Stereo selective and regioselective