JEE Advanced · 2018 · 20 May 2018 · Paper 1 · Hydrocarbons

The reaction(s) leading to the formation of 1,3,5-trimethylbenzene is (are)

(A)(see structure)
✓ Correct
(B)(see structure)
✓ Correct
(C)(see structure)
(D)(see structure)
✓ Correct

Answer: (A), (B), (D)

Solution

1,3,5-trimethylbenzene (mesitylene) can be formed through:

(A) Trimerization of propyne (methylacetylene) under acidic conditions forms mesitylene.

(B) Friedel-Crafts alkylation of benzene with propene in the presence of

AlCl_{3}

followed by further alkylation can lead to mesitylene.

(C) This reaction does not lead to 1,3,5-trimethylbenzene.

(D) Cyclotrimerization of propyne or appropriate rearrangement reactions can produce mesitylene.

Correct answers: (A), (B), and (D).

JEE Advanced · 2018 · 20 May 2018 · Paper 1 · One or more correct options

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