What are the main types of organic reactions and their mechanisms?
(A) The main types of organic reactions are:
$i$. Substitution reactions: In these reactions,an atom or group of atoms in a molecule is replaced by another atom or group.
$ii$. Addition reactions: These involve the addition of two molecules to form a single product,typically occurring in unsaturated compounds.
$iii$. Elimination reactions: These involve the removal of two atoms or groups from a molecule,often resulting in the formation of a double or triple bond.
$iv$. Rearrangement reactions: These involve the migration of an atom or group within the same molecule to form a structural isomer.
$i$. Substitution reactions: In these reactions,an atom or group of atoms in a molecule is replaced by another atom or group.
$ii$. Addition reactions: These involve the addition of two molecules to form a single product,typically occurring in unsaturated compounds.
$iii$. Elimination reactions: These involve the removal of two atoms or groups from a molecule,often resulting in the formation of a double or triple bond.
$iv$. Rearrangement reactions: These involve the migration of an atom or group within the same molecule to form a structural isomer.
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Column-$(I)$ (Reaction) Column-$(II)$ (Type of Reaction) $(A)$ $\text{Cyclohexene} + Br_2 \xrightarrow{\Delta, uv} \text{3-Bromocyclohexene}$ $(i)$ $\text{Nucleophilic substitution}$ $(B)$ $\text{4-Hydroxybenzyl alcohol} + HCl \xrightarrow{\Delta} \text{4-Hydroxybenzyl chloride}$ $(ii)$ $\text{Electrophilic addition}$ $(C)$ $\text{Cyclohexene} + Br_2 \xrightarrow{CCl_4} \text{1,2-Dibromocyclohexane}$ $(iii)$ $\text{Free radical substitution}$ $(D)$ $\text{Toluene} + Cl_2 \xrightarrow{Fe, \text{dark}} \text{o/p-Chlorotoluene}$ $(iv)$ $\text{Electrophilic aromatic substitution}$
| Column-$(I)$ (Reaction) | Column-$(II)$ (Type of Reaction) |
|---|---|
| $(A)$ $\text{Cyclohexene} + Br_2 \xrightarrow{\Delta, uv} \text{3-Bromocyclohexene}$ | $(i)$ $\text{Nucleophilic substitution}$ |
| $(B)$ $\text{4-Hydroxybenzyl alcohol} + HCl \xrightarrow{\Delta} \text{4-Hydroxybenzyl chloride}$ | $(ii)$ $\text{Electrophilic addition}$ |
| $(C)$ $\text{Cyclohexene} + Br_2 \xrightarrow{CCl_4} \text{1,2-Dibromocyclohexane}$ | $(iii)$ $\text{Free radical substitution}$ |
| $(D)$ $\text{Toluene} + Cl_2 \xrightarrow{Fe, \text{dark}} \text{o/p-Chlorotoluene}$ | $(iv)$ $\text{Electrophilic aromatic substitution}$ |
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