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Reaction by which Benzaldehyde cannot be prepared:

1. COCl (a)
2. CO (b)
3. CO (c)
4. CO (d)

Correct answer: CO (d)

Solution

The question seems incomplete or unclear, but based on typical benzaldehyde preparation methods, the reaction involving CO (d) might not align with standard methods like Gattermann-Koch or Rosenmund reduction.

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