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JEE Main · 2021 · 20 Jul 2021 · Shift 1 · d and f Block Elements

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For above chemical reactions, identify the correct statement from the following
Structure A
A
Structure B
B
  1. (A)Both compound 'A' and compound 'B' are dicarboxylic acids.
  2. (B)Compound 'A' is dicarboxylic acid and compound 'B' is diol.✓ Correct
  3. (C)Compound 'A' is diol and compound 'B' is dicarboxylic acid.
  4. (D)Both compound 'A' and compound 'B' are diols.

Answer: (B)

Solution

Hot acidic permanganate is a drastic oxidant and cleaves the double bond of cyclohexene completely: each of the two carbons of the former double bond is oxidised to a carboxyl group, so the ring opens and hexanedioic acid is obtained. Cold dilute permanganate at is Baeyer's reagent, which adds through a cyclic manganate ester and delivers two hydroxyl groups to the same face of the double bond, leaving the ring intact as cis-cyclohexane-1,2-diol. Compound A is a dicarboxylic acid and compound B is a diol.

JEE Main · 2021 · 20 Jul 2021 · Shift 1 · Single correct option

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