JEE Main 2022 · 29 Jun · Shift 1 · Chemistry Q73

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ChemistrySingle correct+4 / -1Question 73 of 90

Two isomers 'A' and 'B' with molecular formula $\mathrm{C_4H_8}$ give different products on oxidation with $\mathrm{KMnO_4}$ in acidic medium. Isomer 'A' on reaction with $\mathrm{KMnO_4/H^+}$ results in effervescence of a gas and gives ketone. The compound 'A' is

But-1-ene.

cis-But-2-ene.

trans-But-2-ene.

2-methyl propene.

Answer and worked solution

Official answer: D

2-Methylpropene $\mathrm{(CH_3)_2C{=}CH_2}$ gives acetone and $\mathrm{CO_2}$ (the terminal $\mathrm{CH_2}$ is oxidised to $\mathrm{CO_2}$ , which effervesces).

(D)

Topics:Alkenes

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JEE Main 2022 · 29 Jun · Shift 1, Chemistry question 73