# The most suitable reagent for the conversion of $R-CH_2 -OH\rightarrow R-CHO$ is
$\begin{array}{1 1}(A)\;CrO_3\\(B)\;PCC (Pyridinium Chlorochromate)\\(C)\;KMnO_4\\(D)\;K_2Cr_2O_7\end{array}$