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(D) Ceric ammonium nitrate test is used to detect the presence of alcoholic $-OH$ groups. It gives a red/yellow color with alcohols.In the given react

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$(b)$ and $(d)$

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(D) Ceric ammonium nitrate test is used to detect the presence of alcoholic $-OH$ groups. It gives a red/yellow color with alcohols.In the given reaction,the starting material is treated with chromic anhydride (a strong oxidizing agent). The primary alcohol group at position '$a$' is oxidized to an aldehyde,and the secondary alcohol group at position '$c$' is oxidized to a ketone.The resulting product '$P$' contains the tertiary alcohol group at position '$b$' and the phenolic $-OH$ group at position '$d$'.However,the ceric ammonium nitrate test is specifically positive for aliphatic alcohols (primary,secondary,and tertiary). Phenols also give a positive test (often red/brown color). Looking at the structure of '$P$',the tertiary alcohol at '$b$' and the phenol at '$d$' remain. Both are capable of giving a positive ceric ammonium nitrate test. Therefore,the presence of both '$b$' and '$d$' groups contributes to the positive test.

Consider the following reaction:
The product $'P'$ gives a positive ceric ammonium nitrate test. This is because of the presence of which of these $-OH$ group$(s)$?

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Consider the following reaction:The product $'P'$ gives a positive ceric ammonium nitrate test. This is because of the presence of which of these $-OH$ group$(s)$?