Reaction by which Benzaldehyde cannot be prepared?

1. A. + CrO2Cl2 in CS2 followed by H3O+
2. B. + H2 in presence of Pd-BaSO4
3. C. + CO + HCl in presence of anhydrous AlCl3
4. D. + Zn/Hg and conc. HCl

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