A) \[KMn{{O}_{4}}\]
B) \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]
C) \[Cr{{O}_{3}}\]
D) PCC (pyridine chloro chromate)
Correct Answer: D
Solution :
By oxidation, alcohols are converted into aldehydes. Hence, mild oxidising agent like PCC is used to convert alcohols into aldehydes. \[RC{{H}_{2}}OH\xrightarrow[{}]{PCC}RCHO\] Strong oxidising agents like acidified\[KMn{{O}_{4}},\] acidified\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]f used, convert alcohols directly into acids, thus they are not used for oxidation-of alcohol to aldehydes.
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