Question:
Which reagents would you use to carry out the reaction Ethyl benzene $\rightarrow$ 2 and 4-chloro-1-ethyl benzene?
Which reagents would you use to carry out the reaction Ethyl benzene $\rightarrow$ 2 and 4-chloro-1-ethyl benzene?
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Light/heat → side chain; FeCl$_3$ → ring substitution.
Updated On: Apr 23, 2026
- Cl$_2$, light and heat
- Cl$_2$, FeCl$_3$
- SOCl$_2$
- C$_2$H$_5$Cl, AlCl$_3$
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The Correct Option is B
Solution and Explanation
Concept:
Electrophilic Aromatic Substitution (EAS) — halogenation of benzene ring.
Step 1: Ethyl group is electron-donating (+I effect).
Step 2: It activates ring and directs substitution to ortho/para positions.
Step 3: Cl$_2$/FeCl$_3$ generates Cl$^+$ electrophile.
Step 4: Reaction proceeds via EAS mechanism giving o- and p-products.
Step 5: (A) gives side-chain chlorination, not ring substitution.
Conclusion:
Correct reagent = Cl$_2$/FeCl$_3$
Step 1: Ethyl group is electron-donating (+I effect).
Step 2: It activates ring and directs substitution to ortho/para positions.
Step 3: Cl$_2$/FeCl$_3$ generates Cl$^+$ electrophile.
Step 4: Reaction proceeds via EAS mechanism giving o- and p-products.
Step 5: (A) gives side-chain chlorination, not ring substitution.
Conclusion:
Correct reagent = Cl$_2$/FeCl$_3$
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