The reaction mechanism involved in the conversion of a primary alcohol to an aldehyde using pyridinium chlorochromate PCC as the oxidizing agent is as follows:1. Nucleophilic attack: The oxygen atom of the primary alcohol attacks the chromium atom in PCC, forming a bond between them. This results in the formation of a chromate ester intermediate.2. Electron transfer: A single electron is transferred from the chromium atom to the oxygen atom of the chromate ester, which results in the formation of a double bond between the chromium and oxygen atoms. This step also generates a positive charge on the oxygen atom of the alcohol.3. Proton transfer: A base such as pyridine abstracts a proton from the positively charged oxygen atom, leading to the formation of a double bond between the carbon and oxygen atoms. This forms the aldehyde product.4. Regeneration of the oxidizing agent: The chromium complex formed in the reaction is reduced to Cr III species, which can be regenerated back to PCC by the addition of more PCC.Here is a simple representation of the major intermediate and products involved in the reaction:Primary Alcohol + PCC Chromate Ester Intermediate Aldehyde + Reduced Chromium ComplexPlease note that this is a text-based platform and drawing the structures is not possible. However, you can easily find the structures of the chromate ester intermediate and the products by searching for "PCC oxidation mechanism" in any search engine.