Question 13 Which of the following alcohols CANNOT be oxidized by H2CrO4? HO. HO HO Он II IV V O II O IV OV

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**Question 13**

Which of the following alcohols CANNOT be oxidized by \( \text{H}_2\text{CrO}_4 \)?

Diagrams of chemical structures are labeled as I, II, III, IV, and V.

Options:
- ⭕ I
- ⭕ II
- ⭕ III
- ⭕ IV
- ⭕ V

**Explanation of Diagrams:**

1. **Structure I**: Displays a benzene ring with an attached alcohol group (\(-\text{OH}\)) at one of its carbon atoms, indicating benzyl alcohol.
2. **Structure II**: Shows a linear carbon chain with an alcohol group (\(-\text{OH}\)), representing a simple primary alcohol, ethanol.
3. **Structure III**: Contains a carbon chain with an alcohol group (\(-\text{OH}\)) on a carbon that is part of a carbonyl group (C=O), indicating a hemiacetal.
4. **Structure IV**: Illustrates a secondary alcohol with two alkyl groups attached to the carbon bearing the \(-\text{OH}\) group.
5. **Structure V**: Features a cyclic structure with an alcohol group (\(-\text{OH}\)) on a secondary carbon within the ring.

**Question Analysis:**

The goal is to determine which of these structures cannot undergo oxidation with chromic acid (\( \text{H}_2\text{CrO}_4 \)). Considerations include the oxidation potential of primary, secondary, and tertiary alcohols, along with any structural inhibitions for oxidation.
Transcribed Image Text:**Question 13** Which of the following alcohols CANNOT be oxidized by \( \text{H}_2\text{CrO}_4 \)? Diagrams of chemical structures are labeled as I, II, III, IV, and V. Options: - ⭕ I - ⭕ II - ⭕ III - ⭕ IV - ⭕ V **Explanation of Diagrams:** 1. **Structure I**: Displays a benzene ring with an attached alcohol group (\(-\text{OH}\)) at one of its carbon atoms, indicating benzyl alcohol. 2. **Structure II**: Shows a linear carbon chain with an alcohol group (\(-\text{OH}\)), representing a simple primary alcohol, ethanol. 3. **Structure III**: Contains a carbon chain with an alcohol group (\(-\text{OH}\)) on a carbon that is part of a carbonyl group (C=O), indicating a hemiacetal. 4. **Structure IV**: Illustrates a secondary alcohol with two alkyl groups attached to the carbon bearing the \(-\text{OH}\) group. 5. **Structure V**: Features a cyclic structure with an alcohol group (\(-\text{OH}\)) on a secondary carbon within the ring. **Question Analysis:** The goal is to determine which of these structures cannot undergo oxidation with chromic acid (\( \text{H}_2\text{CrO}_4 \)). Considerations include the oxidation potential of primary, secondary, and tertiary alcohols, along with any structural inhibitions for oxidation.
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