Hexan-1-ol to Hexanal

Which reagent would you choose to convert hexan-1-ol to hexanal?

A. PCC/CH2Cl2.

B. DIBAL/diethyl ether.

C. KMnO4/aqueous H2SO4/acetone.

D. K2Cr2O7/aqueous H2SO4/acetone.

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