Question

Compound X changes the colour of warm acidified sodium dichromate(VI) from

orange to green. 1 mol of X reacts with 2 mol of HCN in the presence of KCN. What

could X be?

A. CH3CH2CH2CHO B. CH3COCH2COCH3

C. H2C=CHCH2CHO D. OHCCH2CH2CHO​

Answer 1

Answer:

D) OHCCH2CH2CHO

This one. Nucleophilic addition to a carbonyl compound to a substance with an OH group and a CN group where the carbonyl group was. The aldehyde group will give the could change, 2 carbonyl groups so 2 mols HCN