Question

write two methods of synthesis of aldehydes​

Answer 1

Answer:

Preparation of Aldehydes : From Hydrocarbons : a) Hydration of alkynes in the presence of H2SO4 and HgSO4 give aldehydes and ketones . ... Nitriles are selectively reduced by di-isobutyl aluminium (DIBAL -H) to imines which hydrolysis give aldehydes.

Explanation:

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Answer 2

Two methods of synthesis of aldehydes​ are as follows:

• By Oxidation of Alcohol: In this method, primary alcohol is Oxidised With the help of KMnO4 in presence of ozone, and this results in aldehydes.                                                                                  

             Equation:   R⁻CH₂-OH $\frac{-------[O]------}{KMnO4}$  R⁻CH⁻O

• By Dehydrogenation of Alcohols: In this method, primary alcohol is passed over a metal catalyst to obtain aldehyde. This method is preferred for the conversion of volatile alcohols into aldehydes.

               Equation: CH₃⁻ CH₂⁻OH $\frac{----Cu-----}{573K}$ CH₃⁻CH⁻O