Statement-1: Aldehydes and ketones having same molecular formulae are structural isomers
and Statement-2: Aldehyde and ketones are metamers.

Options

A. Statement -I is True; Statement -II is True; Statement-II is a correct explanation for Statement-I
B. Statement - I is True; Statement -II is true; Statement-II is not a correct explanation for Statement-I
C. Statement -I is false; Statement -II is False.
D. Statement -I is True; Statement -II is False

Answer

To analyze the statements given in the question, we need to evaluate each statement regarding aldehydes and ketones.

### Step-by-Step Solution:

**Step 1: Understanding Structural Isomers**
- Structural isomers are compounds that have the same molecular formula but different structural arrangements of atoms. This can include different functional groups, chain arrangements, or positions of functional groups.

**Hint for Step 1:** Recall that structural isomers can be classified into different types, including functional isomers, which are particularly relevant for this question.

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**Step 2: Evaluating Statement 1**
- Aldehydes and ketones can have the same molecular formula. For example, propanal (an aldehyde) and acetone (a ketone) both have the molecular formula C3H6O. Since they have the same molecular formula but different functional groups, they are functional isomers, which is a type of structural isomer.

**Hint for Step 2:** Consider examples of aldehydes and ketones that share the same molecular formula to confirm they are structural isomers.

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**Step 3: Understanding Metamers**
- Metamers are a specific type of structural isomer where the isomers have the same functional group but different arrangements of alkyl groups around that functional group. For example, butanol and isobutanol are metamers of each other because they both have the same functional group (alcohol) but different alkyl arrangements.

**Hint for Step 3:** Remember that metamers must have the same functional group, which is not the case for aldehydes and ketones.

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**Step 4: Evaluating Statement 2**
- Aldehydes and ketones do not qualify as metamers because they possess different functional groups (aldehyde vs. ketone). Therefore, they cannot be considered metamers, as metamers must have the same functional group.

**Hint for Step 4:** Compare the functional groups of aldehydes and ketones to see why they cannot be classified as metamers.

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**Step 5: Conclusion**
- From the analysis:
- Statement 1 is true: Aldehydes and ketones with the same molecular formula are structural isomers (specifically functional isomers).
- Statement 2 is false: Aldehydes and ketones are not metamers because they have different functional groups.

**Final Answer:**
- Statement 1 is true, and Statement 2 is false.