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Stilbene: spot the wrong reaction class

Single question

One step from benzaldehyde plus benzyltriphenylphosphonium ylide to stilbene. Atoms balance. Read the reaction class label.

Wittig olefination
Distinguishing C=C formation (Wittig) from C-C alkyl arene formation (Friedel-Crafts)
Mechanistic class hygiene

Find the flaw

Click the step that contains the flaw, or pick “No flaw” if you think every step is correct.

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