Question

The most suitable reagent for the conversion of $RC{H}_{2}OH\to RCHO$ is

• A. $KMn{O}_4$
• B. $K_{2}C{r}_2{O}_7$
• C. $Cr{O}_3$
• D. PCC (pyridine chloro chromate)

Answer 1

Answer: (D)

By oxidation, alcohols are converted into aldehydes. Hence, mild oxidising agent like PCC is used to convert alcohols into aldehydes.
$RC{H}_{2}OH\stackrel{PCC}{\to }RCHO$
Strong oxidising agents like acidified $KMn{O}_4$ acidified $K_{2}C{r}_2{O}_7$ if used, convert alcohols directly into acids, thus they are not used for oxidation of alcohol to aldehydes.