In liver, ethanol is converted to –
**Core Concept**
The liver metabolizes ethanol through a specific enzymatic pathway. **Ethanol** is first converted into **acetaldehyde** by the enzyme **alcohol dehydrogenase**. This process is crucial for understanding the metabolism of alcohol in the human body.
**Why the Correct Answer is Right**
The correct answer is acetaldehyde because it is the direct product of ethanol metabolism by **alcohol dehydrogenase**. This enzyme catalyzes the oxidation of **ethanol** to **acetaldehyde**, which is then further metabolized into **acetate** by **aldehyde dehydrogenase**. The conversion of ethanol to acetaldehyde is a key step in alcohol metabolism.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not the direct product of ethanol metabolism by alcohol dehydrogenase.
**Option B:** Incorrect as it is not directly involved in this initial step of ethanol metabolism.
**Option D:** Incorrect because, although involved in later steps of alcohol metabolism, it is not the direct result of ethanol conversion by alcohol dehydrogenase.
**Clinical Pearl / High-Yield Fact**
It's crucial to remember that **acetaldehyde** is toxic and its accumulation can lead to cellular damage. The rapid conversion of acetaldehyde to acetate is essential to prevent its toxic effects.
**Correct Answer:** D. Acetaldehyde