Acid catalysed hydration of alkenes except ethene leads to the formatio of :

Options

A. primary alcohol
B. secondary or tertiary alcohol
C. mixture of primary and secondary alcohols
D. mixture of secondary and tertiary alcohols.

Explanation

To solve the question "Acid catalyzed hydration of alkenes except ethene leads to the formation of:", we will analyze the hydration process of alkenes and determine the types of alcohols formed.

### Step-by-Step Solution:

1. **Understanding Acid-Catalyzed Hydration**:
- Acid-catalyzed hydration involves the addition of water (H2O) to an alkene in the presence of an acid (H+). This reaction typically follows Markovnikov's rule, which states that the electrophile (H+) will add to the carbon with more hydrogen atoms, while the nucleophile (OH-) will add to the carbon with fewer hydrogen atoms.

2. **Hydration of Ethene**:
- For ethene (CH2=CH2), when we apply acid-catalyzed hydration:
- The double bond breaks, and H+ adds to one carbon, while OH- adds to the other.
- The product formed is ethanol (CH3CH2OH), which is a primary alcohol.

3. **Hydration of Other Alkenes**:
- Now, let's consider other alkenes, such as propene (CH3-CH=CH2):
- Following the same hydration process, H+ will add to the terminal carbon (with more hydrogens), and OH- will add to the middle carbon.
- The product formed is isopropanol (CH3CHOHCH3), which is a secondary alcohol.

4. **Generalizing the Reaction**:
- For alkenes with more than two carbons, the same principle applies. Depending on the structure of the alkene:
- Secondary alcohols can be formed (as seen with propene).
- Tertiary alcohols can also be formed from alkenes like 2-butene (CH3-CH=CH-CH3), where the OH- would add to the more substituted carbon, yielding tert-butanol (CH3)3COH.

5. **Conclusion**:
- Therefore, the acid-catalyzed hydration of alkenes (except ethene) can lead to the formation of secondary and tertiary alcohols, depending on the structure of the alkene used.

### Final Answer:
The acid-catalyzed hydration of alkenes (except ethene) leads to the formation of secondary and tertiary alcohols.

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