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Three organic compounds A, B and C are non cyclic functional isomers of carbonyl compounds with…

Chemistry20252 marksShort answer
Three organic compounds A, B and C are non cyclic functional isomers of carbonyl compounds with molecular formula $\text{C}_4\text{H}_8\text{O}$. Isomers A and C give positive Tollen’s test while compound B does not give positive Tollen’s test but gives positive iodoform test. Compounds A and B on reduction with Zn amalgam and conc. $\text{HCl}$ give the same product.
(a)[1.0]
Write the structures of the compounds A, B and C.
(b)[1.0]
Out of the compounds A, B and C, which one will be the least reactive towards addition of $\text{HCN}$.

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Aldehydes and Ketones

From ISC 2025 Specimen Chemistry Paper 1, question 9(ii).