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For questions having their focus on SN1, SN2, SNi, SN1', SN2', or SN2th (nucleophilic acyl substitution).

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What happens when acetone reacts with hydrogen cyanide?

The acetone carbonyl is attacked by the CN$^-$ that comes from the NaCN. This tetrahedral intermediate has a oxygen anion, which then grabs a proton from the HCN, regenerating the CN$^-$.
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What happens when acetone reacts with hydrogen cyanide?

Which of the following is the major organic product when acetone is allowed to react with hydrogen cyanide in the presence of a catalytic amount of sodium cyanide? The correct answer is (B) …
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