Different reagents used for the identification of different functional groups.
Eg. (i)Tollens reagent used for the identification of -CHO, etc.
(ii)CAN used for alcohol.
`{:("Column-I","Column-II","Column-III"),((I)"Benzaldehyde",(i)l_2+NaOH(aq.),(P)"Yellow crystals is formed"),((II)"Butan-1-ol",(ii)AgNO_3(aq.)+NH_4OH,(Q)"White ppt is formed"),((III)"Formic ester",(iii)anhy.ZnCl_2+conc.HCl,(R)"Silver mirror is formed"),((IV)"Acetophenone",(iv)(NH_4)_2[Ce(NO_3)_6](CAN),(S)"Wine red colouration"):}`
The only correct combination in which the reation does not proceed through redox mechanism ?

Options

A. (I),(ii),(R)
B. (IV),(i)(P)
C. (II),(iv)(S)
D. (III),(ii)(R)

Explanation

To solve the question regarding the identification of different functional groups and to determine the only correct combination in which the reaction does not proceed through a redox mechanism, we can follow these steps:

### Step 1: Understand the Reagents and Their Reactions
We need to analyze each reagent and its corresponding functional group to see if a redox reaction occurs.

1. **Tollens' Reagent (AgNO3 + NH4OH)**: This reagent is used to identify aldehydes (e.g., Benzaldehyde). In this reaction, the aldehyde is oxidized to a carboxylic acid while the silver ion is reduced to metallic silver, resulting in a silver mirror. This is a redox reaction.

2. **Ceric Ammonium Nitrate (CAN)**: This reagent is used for the identification of alcohols (e.g., Butan-1-ol). When alcohol reacts with CAN, a complex is formed that results in a wine-red coloration. There is no oxidation or reduction occurring here, which means this is not a redox reaction.

3. **Iodine (I2 + NaOH)**: This reagent is typically used for the identification of aldehydes and ketones. It involves a redox reaction where iodine is reduced.

4. **Anhydrous Zinc Chloride + Concentrated HCl**: This combination is used for the identification of formic ester (or esters in general). This reaction also involves redox processes.

### Step 2: Identify the Correct Combination
Now we will match the reagents with the functional groups and check if they involve redox reactions:

- **(I) Benzaldehyde + Tollens' Reagent**: Redox reaction (Silver mirror is formed).
- **(II) Butan-1-ol + CAN**: No redox reaction (Wine red coloration is formed).
- **(III) Formic ester + Anhydrous ZnCl2 + HCl**: Redox reaction.
- **(IV) Acetophenone + Iodine + NaOH**: Redox reaction (White ppt is formed).

### Conclusion
The only combination that does not proceed through a redox mechanism is:
- **(II) Butan-1-ol with CAN (Ceric Ammonium Nitrate)**, which results in a wine-red coloration.

### Final Answer
The correct combination is **(II) Butan-1-ol with (iv) CAN, resulting in (S) Wine red coloration**.

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