Which of the following compounds can change the colour of chromic acid from orange to green ?

Options

A. `C_(2)H_(5)OC_(2)H_(5)`
B. `(CH_(3))_(3)C-OH`
C. `CH_(3)CH_(2)CH_(2)OH`
D. `CH_(3)COCH_(3)`

Answer

C

Explanation

Dichromate in acid has a bright orange color. When it oxidizes an alcohol `(1^(@) or 2^(@))` , it is reduced to blue -green `Cr(III)`. The change in colour indicates that the alcohol is not `3^(@)`.A distinction between `1^(@)` and `2^(@) ROH's` is not possible with this reagent.
`underset(1^(@) or 2^(@))(ROH) + underset("Clear,orange")(HCrO_(4)^(-)) rarr` Opaque, blue-green`