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JEE Advanced levelSingle correct optionDifficulty 3 of 3ro142

Butan-1-ol is oxidised completely to butanoic acid by chromic acid, with the chromium going from $Cr (VI)$ to $Cr X^{3 +}$ . The moles of $CrO X_{3}$ consumed per mole of butan-1-ol are

A $2$
B $\frac{4}{3}$
C $1$
D $\frac{2}{3}$

Answer: B

Oxidising the carbinol carbon from

- 1

to

+ 3

removes 4 electrons per alcohol molecule. Each

Cr (VI)

to

Cr X^{3 +}

accepts 3 electrons. Moles of

CrO X_{3}

= 4/3

per mole of alcohol.

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