Write the chemica

A. The chemical equation involved in Clemmenson reduction is as follows:

This is the mechanism of the above reaction.

Note - 2e^- is from zinc as it donates to form Zn²⁺.

B.

The chemical equation of Hell-Volhard Zelinsky is as follows.

This is the mechanism of it.

OR

A.

This above reaction is known as Etard reaction

Note – A sigmatropic reaction in organic chemistry is a pericyclic reaction wherein the net result is one σ-bond is changed to another σ-bond in an uncatalyzed intramolecular reaction.

B.

Following reaction takes place:

O=CH₂–Cl CH₂–COOH CH₃–CH₂–OH