Which of the following statements is correct?

Options

A. Structural isomers have similar physical and chemical properties.
B. Alcohols and ethers form functional pairs.
C. The compound having formula `C_4 H_(11) N` has two metamers.
D. Tautomerism and resonance are two different names for the same phenomenon.

Explanation

To solve the question regarding which statement is correct, we will analyze each of the provided statements step by step.

### Step 1: Analyze Statement A
**Statement A:** Structural isomers have similar physical and chemical properties.

- **Analysis:** This statement is false. Structural isomers are compounds that have the same molecular formula but different structural arrangements. For example, consider the isomers of C2H6O: ethanol (CH3CH2OH) and dimethyl ether (CH3OCH3). These two compounds have different functional groups (alcohol vs ether), leading to significant differences in their physical and chemical properties, such as boiling points and reactivity.

### Step 2: Analyze Statement B
**Statement B:** Alcohols and ethers form functional pairs.

- **Analysis:** This statement is true. Alcohols (which contain the -OH functional group) and ethers (which have the R-O-R structure) are indeed functional pairs. They differ in their functional groups, leading to differences in their properties and reactivity. Therefore, this statement is correct.

### Step 3: Analyze Statement C
**Statement C:** The compound having the formula C4H11N has two metamers.

- **Analysis:** This statement is false. Metamers are structural isomers that differ in the arrangement of atoms around a functional group. For C4H11N, there are actually three possible metamers, not two. Examples include butylamine, isobutylamine, and sec-butylamine. Thus, this statement is incorrect.

### Step 4: Analyze Statement D
**Statement D:** Tautomerism and resonance are the two different names for the same phenomenon.

- **Analysis:** This statement is false. Tautomerism involves the shifting of atoms (usually hydrogen) between different structural forms (like keto and enol forms), while resonance involves the delocalization of electrons within a molecule without any change in the position of atoms. They are fundamentally different concepts in organic chemistry.

### Conclusion
After analyzing all the statements, we find that the only correct statement is **Statement B**: Alcohols and ethers form functional pairs.

### Final Answer
The correct statement is **B: Alcohols and ethers form functional pairs.**

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