Why is acetyl cyanide not obtained from acetyl chloride? Why doesn't acetyl chloride or any other aliphatic acyl chloride react with cyanide ions and undergo nucleophilic addition elimination to form aliphatic acyl cyanide, even though this reaction occurs for aromatic acyl chloride?

This was the related question in my workbook:


  Which of the following compounds will react with ethanolic $\ce{KCN}$?
  A) ethyl chloride B) acetyl chloride C) chlorobenzene D) benzaldehyde


My answer is A, B, D undergoing SN2, nucleophilic addition-elimination, and benzoin condensation respectively.
Answer is given as only A,D.

Searching the internet led me to this article, but I am not able to understand why.
Acetyl chloride on reacting with $\ce{KCN}$ in ethanol will give ethyl acetate. If acetyl cyanide forms at all, it will immediately react with the ethanol solvent as it is a more reactive species than acetyl chloride.

Acetyl cyanide is known and may be formed by catalytic reaction of hydrogen cyanide and ketene at elevated temperature. Details.

Aromatic acyl cyanides are less reactive than alkyl acyl cyanides much as aromatic acyl chlorides are less reactive. They may be formed by reaction of the neat aromatic acyl chloride with cuprous cyanide (details) and are stable to a wash with cold aq. sodium bicarbonate.