Which one of the following compounds is the b | vedclass

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(B) An efficient mixed aldol addition reaction requires one carbonyl component to have $\alpha$-hydrogens (to act as the nucleophile) and the other ca

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(B) An efficient mixed aldol addition reaction requires one carbonyl component to have $\alpha$-hydrogens (to act as the nucleophile) and the other carbonyl component to have no $\alpha$-hydrogens (to act as the electrophile). Formaldehyde $(HCHO)$ is an excellent electrophile because it has no $\alpha$-hydrogens and is highly reactive toward nucleophilic attack. Propiophenone $(C_6H_5COCH_2CH_3)$ has $\alpha$-hydrogens on the $CH_2$ group,allowing it to form an enolate. The reaction between propiophenone and formaldehyde is an efficient mixed aldol reaction. The product formed is $C_6H_5COCH(CH_3)CH_2OH$.

Which one of the following compounds is the best choice for being prepared by an efficient mixed aldol addition reaction?

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