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  • Write down functional isomers of a carbonyl compound with molecular formula C_{3}H_{6}O. Which isomer will react faster with HCN and why? Explain the mechanism of the reaction also.

Write down functional isomers of a carbonyl compound with molecular formula C_{3}H_{6}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 whole reactant into product at reaction conditions? If a strong acid is added to the reaction mixture what will be the effect on concentration of the product and why?

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C_{3}H_{6}O_{} will have following isomer.


Compound 1 (Propanal) is more susceptible to a reaction with HCN as carbon atom in carbonyl group acquires more positive charge than carbon atom in compound 2 (propan-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. Addition of an acid hinders the formation of CN- ion and thus, can stop the reaction.

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