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JEE Main levelSingle correct optionDifficulty 2 of 3ap044

Which alcohol does NOT turn the orange chromic acid ( $CrO X_{3}$ in aqueous $H X_{2} SO X_{4}$ , Jones reagent) green within a few seconds?

Apropan-2-ol
Bethanol
C2-methylbutan-2-ol
Dcyclohexanol

Answer: C

Primary and secondary alcohols are oxidised, reducing

Cr (VI)

(orange) to

Cr (III)

(green). The tertiary alcohol 2-methylbutan-2-ol is not oxidised under these conditions, so the colour stays orange.

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