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Write down functional isomers of a carbonyl compound with molecular formula $\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}. Which isomer will react faster with HCN and why? Explain the mechanism of the reaction also. Will the reaction lead to the completion with the conversion of the whole reactant into the product at reaction conditions? If a strong acid is added to the reaction mixture what will be the effect on the concentration of the product and why?

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\mathrm{C}_3 \mathrm{H}_6 \mathrm{O} will have following isomer.


Compound 1 (Propanal) is more susceptible to a reaction with HCN as the carbon atoms in the carbonyl group acquire more positive charge than the carbon atom in compound 2 (propane-2-one). Moreover, there is much less static hindrance in compound 1 compared to compound 2.

Equilibrium is established in this reaction as it is reversible in nature. The addition of an acid hinders the formation of CN^- ions and thus, can stop the reaction.

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