Hot and conc. `KMnO_4` at 373-383 K reacts with pent - 2- ene to form

Options

A. propionic acid only
B. ethonoic acid only
C. a mixture of propionic acid and ethanoic acid
D. a mixture of butanoic and formic acid

Answer

To solve the problem of what products are formed when hot and concentrated KMnO4 reacts with pent-2-ene, we can follow these steps:

### Step 1: Identify the Reactant
The reactant is pent-2-ene, which has the following structure:

```
CH3
|
CH3-CH=CH-CH2-CH3
```

### Step 2: Understand the Reaction Conditions
The conditions specified are hot and concentrated KMnO4 at temperatures between 373 K and 383 K. Under these conditions, KMnO4 acts as a strong oxidizing agent.

### Step 3: Determine the Type of Reaction
The reaction that occurs is oxidative cleavage of the double bond. KMnO4 cleaves the carbon-carbon double bond (C=C) and oxidizes the resulting fragments.

### Step 4: Perform the Oxidative Cleavage
When pent-2-ene undergoes oxidative cleavage, the double bond between the second and third carbon atoms is broken. This results in the formation of two carbonyl compounds:

1. The left fragment (from CH3-CH=) will form an aldehyde.
2. The right fragment (from =CH-CH2-CH3) will also form an aldehyde.

### Step 5: Identify the Products
The products of the oxidative cleavage of pent-2-ene are:

- From the left fragment: CH3CHO (which is acetaldehyde)
- From the right fragment: CH3CH2CHO (which is propanal)

### Step 6: Further Oxidation
Since KMnO4 is a strong oxidizing agent, the aldehydes can be further oxidized to carboxylic acids:

- CH3CHO (acetaldehyde) is oxidized to CH3COOH (acetic acid).
- CH3CH2CHO (propanal) is oxidized to CH3CH2COOH (propanoic acid).

### Final Products
Thus, the final products formed from the reaction of pent-2-ene with hot and concentrated KMnO4 are a mixture of acetic acid (CH3COOH) and propanoic acid (CH3CH2COOH).

### Summary of the Reaction
- Reactant: Pent-2-ene
- Reaction Conditions: Hot and concentrated KMnO4 (373-383 K)
- Products: Acetic acid (CH3COOH) and Propanoic acid (CH3CH2COOH)

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