The structure of PCC is

1. $\mathrm{C}_6 \mathrm{H}_5 \stackrel{\oplus}{\mathrm{N}} \mathrm{HCrO}_2 \mathrm{Cl}^{\ominus}$
2. $\mathrm{C}_6 \mathrm{H}_5 \stackrel{\oplus}{\mathrm{N}} \mathrm{HCrO}_3 \mathrm{Cl}^{\ominus}$
3. $\mathrm{C}_5 \mathrm{H}_5 \stackrel{\oplus}{\mathrm{N}} \mathrm{HCrO}_2 \mathrm{Cl}^{\ominus}$
4. $\mathrm{C}_5 \mathrm{H}_5 \stackrel{\oplus}{\mathrm{N}} \mathrm{HCrO}_3 \mathrm{Cl}^{\ominus}$

Solution

Pyridinium chlorochromate (PCC) can be prepared by the dissolution of chromium trioxide in aqueous $\mathrm{HCl}$. Addition of pyridine gives pridinium chlorochromate as orange cryotol.
PCC offers the advantage of the selective oxidation of alcohols to aldehydes, whereas many other reagents are less selective.

Asked in: AP EAMCET 2013

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