An unknown aldehyde a on reacting with alkali gives

Asked by admin @ 20/08/2021 in Chemistry viewed by 276 People

An unknown Aldehyde 'A' on reacting with alkali gives Beta-hydroxy-aldehyde, which loses water to from an unsaturated aldehyde, But-2-enal. Another aldehyde 'B' undergoes disproporational reaction in the presence of con.alkali to form products 'C' and 'D'. C is an aryl alcohol with the formula C7H8O.

i. Write the sequence of the reactions involved.
ii. Name the product, when 'B' reacts with Zinc amalgam and HCl.

Answered by admin @ 20/08/2021

When B reacts with Zinc Amalgam and HCl, Toluene (C6H5CH3) is formed

Explanation:

Aldehyde compound A in reacting with alkali gives a β-hydroxy aldehyde which loses water to form unsaturated aldehyde but-2-enal. This is Aldol condensation reaction.

The aldehyde compound B undergo disproportion reaction with concentrated alkali. This is Cannizzaro's reaction.

Product C is an aryl alcohol with formula C7H8O. It must be C6H5CH2OH and formed by the condensation of benzaldehyde.

A is Ethanol - CH3CHO.

B is Benzaldehyde - C6H5CHO

Please refer to the attached picture for the sequence of reactions.

When B reacts with Zinc Amalgam and HCl, Toluene (C6H5CH3) is formed.

Take any three non-collinear points a b c and draw triangle a,b,c. through each vertex of the triangle draw a line parallel to the opposite side using ruler and compass

Asked by wiki @ 15/11/2022 in Mathematics viewed by 1509 persons

An unknown aldehyde a on reacting with alkali gives

When B reacts with Zinc Amalgam and HCl, Toluene (C6H5CH3) is formed

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