Question

The products obtained by the ozonolysis of 2-methylbut-1-ene are:

• A. Propanone and ethanal
• B. Propanone and methanal
• C. Butanone and methanal
• D. Ethanal and propanal
• E. Butanone and methanol

Hint:

Ozonolysis of alkenes breaks the double bond and forms two carbonyl compounds, typically aldehydes and/or ketones, depending on the structure of the alkene.

Answer 1

The Correct Option is B

Step 1: Understand the process of ozonolysis.
Ozonolysis is the reaction of an alkene with ozone (O\(_3\)) that leads to the cleavage of the double bond, forming two carbonyl compounds. Ozonolysis of alkenes typically results in the formation of aldehydes, ketones, or a combination of both, depending on the structure of the alkene.
Step 2: Analyze the structure of 2-methylbut-1-ene.
2-Methylbut-1-ene is an alkene with the structure: \[ \text{CH}_3\text{CH}_2\text{C}(\text{CH}_3)\text{=CH}_2 \] It has a double bond between carbon atoms 1 and 2, and a methyl group attached to carbon 2.
Step 3: Apply ozonolysis to 2-methylbut-1-ene.
The ozonolysis of 2-methylbut-1-ene involves breaking the carbon-carbon double bond between C1 and C2. The reaction produces two carbonyl compounds:
- The cleavage of the double bond forms two products: 1. A compound where the C1 carbon forms a carbonyl group (propanone, also known as acetone).
2. A compound where the C2 carbon forms a carbonyl group (methanal, also known as formaldehyde).
\[ \text{CH}_3\text{CH}_2\text{C}(\text{CH}_3)\text{=CH}_2 \xrightarrow{\text{O}_3} \text{Propanone} + \text{Methanal} \]
Step 4: Final Answer.
Therefore, the products of the ozonolysis of 2-methylbut-1-ene are propanone and methanal.