Which type of organic reaction is shown below?
CH2==CH2 + HBR ---> CH3--CH2Br
Question 14 options:
a) addition
b) elimination
c) substitution
d) condensation
e) polymerization
a) addition
The type of organic reaction shown in the equation CH2==CH2 + HBr ---> CH3--CH2Br is option a) addition. In this reaction, an unsaturated compound (alkene) CH2==CH2 reacts with a halogen acid (HBr) to form a saturated compound (alkyl halide) CH3--CH2Br. The double bond in the alkene is replaced by a single bond with the bromine atom, resulting in the addition of the bromine atom to the alkene.
The type of organic reaction shown in the given equation is an addition reaction.
To determine the type of organic reaction, it's important to understand the characteristics of each type and analyze the given reaction. Here's a brief explanation of each type of organic reaction:
a) Addition: This type of reaction occurs when two molecules combine, resulting in the formation of a single product. It usually involves the addition of atoms or groups to a carbon-carbon double or triple bond.
b) Elimination: In elimination reactions, a molecule splits into two products, often by the removal of two substituents or atoms from adjacent carbon atoms.
c) Substitution: Substitution reactions involve the replacement of an atom or group in a molecule with another atom or group. This can occur through various mechanisms, such as nucleophilic, electrophilic, or radical substitutions.
d) Condensation: Condensation reactions involve the combination of two molecules, resulting in the formation of a larger molecule, often accompanied by the elimination of a small molecule, such as water.
e) Polymerization: Polymerization reactions involve the combination of monomers to form a polymer, typically through the formation of covalent bonds.
Now, let's analyze the given reaction: CH2==CH2 + HBR ---> CH3--CH2Br
In this reaction, the reactant ethene (CH2==CH2) undergoes an addition reaction with hydrogen bromide (HBr) to form the product ethyl bromide (CH3--CH2Br). The double bond between the carbon atoms in ethene breaks, and the hydrogen atom from HBr adds to one carbon atom while the bromine atom adds to the other carbon atom.
Since this reaction involves the addition of atoms to the double bond of ethene, it is classified as an addition reaction. Thus, the correct answer is option a) addition.