Write equation for:
i) The reaction between Carboxylic acid and `PCl_(5)`
ii) The reaction between formaldehyde and conc KOH.
iii) The formation of oxime from carbonyl compound. 

Explanation

i) `underset("Carboxylic acid")(R-COOH)+PCl_(5)rarr underset("Acid chloride")(R-COCl)+underset("Phosphorous")(POCl_(3))+underset("oxy chloride")(HCl)`
ii) `underset("Aldehyde")(2H-overset(H)overset(|)C=O)+KOH rarr underset("Potassium formate")(H-COONa)+underset("Methanol")(CH_(3)-OH)`
iii) `-overset(|)C=O+underset("Hydroxyl amine")(H_(2)N-OH) overset(H^(+))rarr underset("oxime")(-overset(|)C=N-OH)+H_(2)O`