A) acidified \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]
B) acidified \[KMn{{O}_{4}}\]
C) alkaline \[KMn{{O}_{4}}\]
D) periodic acid
Correct Answer: C
Solution :
In presence of \[HN{{O}_{3}}\] or alkaline \[KMn{{O}_{4}}\]
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