In the addition of HCN to ethanal, why is a small amount of base added?
Correct answer D. To produce CN⁻ ions, the actual nucleophile
Explanation
HCN is a weak acid and gives few CN⁻ ions. Base increases the cyanide ion concentration, and CN⁻ attacks the carbonyl carbon. The product is 2-hydroxypropanenitrile.
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