Indian Forest Service (Mains), Chemistry optional · 2022 · Paper II

Q7(b). Tautomers and chromophores

Question

Draw the tautomers of but-3-en-2-one and identify their chromophoric and auxochromic groups.

The keto form is CH₃COCH=CH₂; methyl-side enolization gives CH₂=C(OH)CH=CH₂.

Part of VKC Basic

Read the key points and the full model answer with VKC Basic

VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.

The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

The handwritten model answer pages open with the VKC plan.

Coversketo–enol tautomerismchromophoreauxochromebut-3-en-2-oneUV transitions