Question:
Identify the major product of the following reaction:
Identify the major product of the following reaction:
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Halogens are ortho/para-directing despite being deactivating. Para product dominates due to steric considerations.
Updated On: May 20, 2025
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The Correct Option is D
Solution and Explanation
Chlorobenzene is an electron-withdrawing group through induction (–I), but an ortho/para-directing group due to +R (resonance) effect.
When bromination is carried out using Br\(_2\) in the presence of anhydrous FeCl\(_3\) (a Lewis acid catalyst), electrophilic aromatic substitution occurs.
Since Cl directs the incoming Br to ortho and para positions, the para product is major due to:
- Less steric hindrance
- Better stability
\[ \text{Product: para-bromochlorobenzene} \]
When bromination is carried out using Br\(_2\) in the presence of anhydrous FeCl\(_3\) (a Lewis acid catalyst), electrophilic aromatic substitution occurs.
Since Cl directs the incoming Br to ortho and para positions, the para product is major due to:
- Less steric hindrance
- Better stability
\[ \text{Product: para-bromochlorobenzene} \]
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