Reaction Analysis: Ozonolysis of Alkene

The given reaction involves ozonolysis of an alkene. Ozonolysis is a reaction where an alkene is cleaved by ozone (O₃) followed by a reductive workup (typically Zn/H₂O or Zn/AcOH) to yield carbonyl compounds (aldehydes or ketones).

Step 1: Identify the Alkene Structure

The reactant is an alkene with the structure: $C H_{3} - C H = C H - C H_{3}$ (2-Butene). The double bond is between carbons 2 and 3.

Step 2: Understand Ozonolysis Cleavage

In ozonolysis, the double bond is cleaved, and each carbon of the double bond becomes a carbonyl carbon. The substituents attached to these carbons determine whether the product is an aldehyde or ketone:

If a carbon has two hydrogen atoms, it becomes formaldehyde (HCHO).
If a carbon has one hydrogen and one alkyl group, it becomes an aldehyde (RCHO).
If a carbon has two alkyl groups, it becomes a ketone (RCOR').

Step 3: Apply to 2-Butene

For 2-Butene ( $C H_{3} - C H = C H - C H_{3}$ ):
- Carbon 2 has one H and one CH₃ group → becomes acetaldehyde (CH₃CHO).
- Carbon 3 has one H and one CH₃ group → becomes acetaldehyde (CH₃CHO).

Thus, the products are two molecules of acetaldehyde: $2 C H_{3} C H O$

Step 4: Compare with Options

Now, examine the given options:

Option 1: Acetaldehyde (CH₃CHO) - Correct.
Option 2: Formaldehyde (HCHO) - Incorrect, as no carbon has two H atoms.
Option 3: Acetone (CH₃COCH₃) - Incorrect, as no carbon has two alkyl groups.
Option 4: Acetaldehyde (CH₃CHO) - Correct (same as option 1, but shown separately).

Both Option 1 and Option 4 represent acetaldehyde, so they are both correct products.

Final Answer

The possible products are Option 1 and Option 4 (both are acetaldehyde, CH₃CHO).

Related Topics

Alkene Reactions: Hydrogenation, halogenation, hydrohalogenation, hydration.
Oxidative Cleavage: KMnO₄ oxidation of alkenes.
Carbonyl Chemistry: Properties and reactions of aldehydes and ketones.

Key Formulae and Theory

Ozonolysis General Reaction:
$R 1 R 2 C = C R 3 R 4 \overset{1 . O 3, 2 . Z n / H 2 O}{\to} R 1 R 2 C = O + O = C R 3 R 4$

Notes: Reductive workup (Zn/H₂O) gives aldehydes and ketones. Oxidative workup (H₂O₂) converts aldehydes to carboxylic acids.