33. Consider the following sequence of reactions: Benzene> A ( In presence of CO, HCl, Anhydrous AlCl3/ CuCl) A> PhCH= CHCOPh ( In presence of 'B', OH, 293 K) The substance 'B' is: 1. Benzene 2. Acetophenone 3. Benzaldehyde 4. Acetone

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