An organic compound does not react appreciably with Lucas reagent but give white precipitate with Tollen's reagent. Which is the possible structure of compound ?

Options

A. `CH_(3)-underset(OH)underset(|)(CH)-C-=CH`
B. `CH_(3)-C-=C-CH_(2)-CH_(2)-OH`
C. `HC-=C-CH_(2)-CH_(2)-OH`
D. `CH_(2)=C=CH-CH_(2)-OH`

Explanation

To solve the question regarding the organic compound that does not react appreciably with Lucas reagent but gives a white precipitate with Tollen's reagent, we can follow these steps:

### Step 1: Understanding the Reagents
- **Lucas Reagent**: This reagent is used to differentiate between primary, secondary, and tertiary alcohols. Primary alcohols do not react appreciably with Lucas reagent at room temperature, while secondary and tertiary alcohols do react.
- **Tollen's Reagent**: This reagent is used to test for aldehydes and terminal alkynes. A positive test results in the formation of a white precipitate of silver.

### Step 2: Analyzing the Given Information
- The compound does **not** react with Lucas reagent, indicating it is likely a **primary alcohol** or an **alkyne**.
- The compound **does** give a white precipitate with Tollen's reagent, suggesting it is either a **terminal alkyne** or an **aldehyde**.

### Step 3: Identifying the Possible Structures
- Since the compound does not react with Lucas reagent, it cannot be a secondary or tertiary alcohol. Therefore, it is likely a **primary alcohol** or a **terminal alkyne**.
- The formation of a white precipitate with Tollen's reagent indicates that the compound is likely a **terminal alkyne** because terminal alkynes can react with Tollen's reagent to form a silver precipitate.

### Step 4: Drawing the Structure
- A terminal alkyne has the general formula of CnH2n-2. For example, a terminal alkyne with 5 carbon atoms could be represented as:
- Structure: CH≡C-CH2-CH2-CH3
- This structure confirms that it has a triple bond at one end (terminal) and fits the criteria of the question.

### Conclusion
The possible structure of the compound is a **terminal alkyne** with the molecular formula C5H8, which does not react with Lucas reagent but gives a white precipitate with Tollen's reagent.