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Which of the following reagent is the most suitable for converting benzyl alcohol into benzaldehyde

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Which of the following reagent is the most suitable for converting benzyl alcohol into benzaldehyde
A. `KMnO_(4),NaOH`
B. `K_(2)Cr_(2)O_(7),H_(2)SO_(4)`
C. `CrO_(3),CH_(3)COOH`
D. `MnO_(2)`
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Correct Answer - D
`MnO_(2)` selectively oxidizes the `OH` group of allylic and benzlic `1^(@)` and `2^(@)` alcohols to give aldehydes and ketones :
`C_(6)H_(5)CH_(2)OH overset(MnO_(2))rarr C_(6)H_(5)CHO`
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