Identify the reagent A in the following conversion. Alkyl halide $\rightarrow$ Alkyl nitrite
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Logic Tip: A classic memorization rule for ambidentate nucleophiles:
Ionic salt ($KNO_2$ or $KCN$) $\rightarrow$ Attack from the more electronegative atom (Oxygen or Carbon) $\rightarrow$ Alkyl Nitrite or Alkyl Cyanide.
Covalent salt ($AgNO_2$ or $AgCN$) $\rightarrow$ Attack from the less electronegative/softer atom (Nitrogen) $\rightarrow$ Nitroalkane or Isocyanide.