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# Which of the following reagents can be used to oxidised primary alcohol to aldehydes ?

$\begin{array}{1 1} \text{CrO_3 in anhydrous medium } \\ KMnO_4 \text {in acidic medium } \\ \text{pyridinium chlorochromate} \\ \text{Heat in the presence of Cu at 573 k} \end{array}$

$\text{pyridinium chlorochromate}$