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Organic Chemistry Reactions Quiz

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Questions and Answers

Which step in the halogenation of benzene is considered the rate-determining step?

Addition of Cl to FeCl3 (correct)

Formation of σ Complex

Generation of Cl radical

Formation of FeCl4-

What is the role of the catalyst in the Friedel-Crafts Alkylation reaction?

Speed up the formation of the electrophile (correct)

Convert the methyl chloride to toluene

Prevent the reaction from occurring

Catalyze the formation of toluene

Which species acts as a Lewis acid in the halogenation mechanism?

FeCl4-

HCl

FeCl3 (correct)

Cl radical

What is the product of nitration of nitrobenzene?

Nitrobenzene Signup and view all the answers

What is the purpose of H2SO4 in the sulphonation of benzene?

To protonate SO3 and generate electrophile Signup and view all the answers

What is the major disadvantage of Friedel-Crafts alkylation with respect to polyalkylation?

Polymerization of the alkyl group Signup and view all the answers

Which step involves the formation of a σ Complex during SE aromatic substitution?

Step 2: Z anion H Slow + E Signup and view all the answers

Why do benzene rings with strong deactivating groups like NO2, SO3H, CHO, or COOH not undergo Friedel-Crafts alkylation?

Strong electron-withdrawing effect of the substituents Signup and view all the answers

In Friedel-Crafts alkylation, what leads to the rearrangement of the alkyl group?

Formation of a carbocation intermediate Signup and view all the answers

One advantage of Friedel-Crafts acylation over alkylation is:

No polyacylation or rearrangement Signup and view all the answers

What is a common drawback of Friedel-Crafts alkylation when dealing with NH2, NHR, or NR2 substituted benzene rings?

Formation of stable complexes with AlCl3 Signup and view all the answers

What effect does the +I effect of CH3 group have in Friedel-Crafts alkylation?

Activates the ring of toluene more than the ring of benzene Signup and view all the answers