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Which of the following reagents cannot b...

Which of the following reagents cannot be used for differentiation between `CH_(3)CHO"and"CH_(3)-underset(O)underset(||)(C)-Ph` ?

A

NaOI

B

Tollen's reagent

C

`H_(2)N-OH`

D

`Ph-NH-NH_(2)`

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the following reagents cannot be used to differentiate between CH₃CHO (acetaldehyde) and CH₃C(=O)Ph (acetophenone), we need to analyze the chemical behavior of these compounds with different reagents. ### Step-by-Step Solution: 1. **Identify the Compounds**: - CH₃CHO is an aldehyde (acetaldehyde). - CH₃C(=O)Ph is a ketone (acetophenone). 2. **Understanding the Reagents**: - **NaOI (Sodium Iodide in Alcohol)**: This reagent is used for the iodoform reaction, which can occur with both aldehydes and methyl ketones. In both cases, it leads to the formation of iodoform (CHI₃). Therefore, it cannot differentiate between the two compounds. - **Tollens' Reagent**: This reagent is a weak oxidizing agent that reacts with aldehydes to produce a silver mirror but does not react with ketones. Thus, it can differentiate between CH₃CHO and CH₃C(=O)Ph. - **Hydroxylamine (H₂N-OH)**: This reagent forms oximes with both aldehydes and ketones. Thus, it cannot differentiate between CH₃CHO and CH₃C(=O)Ph. - **Phenylhydrazine (PhNHNH₂)**: This reagent reacts with both aldehydes and ketones to form phenylhydrazones. Therefore, it cannot differentiate between the two compounds. 3. **Conclusion**: - The reagents that cannot be used for differentiation are **NaOI, Hydroxylamine (H₂N-OH), and Phenylhydrazine (PhNHNH₂)**. - The reagent that can be used for differentiation is **Tollens' reagent**. ### Final Answer: The reagents that cannot be used for differentiation between CH₃CHO and CH₃C(=O)Ph are: - NaOI - Hydroxylamine (H₂N-OH) - Phenylhydrazine (PhNHNH₂)
To determine which of the following reagents cannot be used to differentiate between CH₃CHO (acetaldehyde) and CH₃C(=O)Ph (acetophenone), we need to analyze the chemical behavior of these compounds with different reagents. ### Step-by-Step Solution: 1. **Identify the Compounds**: - CH₃CHO is an aldehyde (acetaldehyde). - CH₃C(=O)Ph is a ketone (acetophenone). ...
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