(A), (B) and (C) are three non-cyclic functional isomers of a carbonyl compound with molecular formula C₄H₈O. Isomers (A) and (C) give positive Tollen’s Test whereas isomer (B) doesn’t give Tollen’s Test but gives positive Iodoform test. Isomers (A) and (B) on reduction with Zn (Hg)/Conc. HCl give the same product (D).
a. Write the structures. (A), (B), (C) and (D).
b. Out of. (A), (B) & (C) which one is less reactive towards addition of HCN?

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b. (B) as ketones are less reactive than aldehydes and alkane due to higher hindrance caused by steric effect and inductive effect.

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