Which of the following set of compounds have same molecular formula?

Options

A. Butane and iso-butane
B. Cyclohexane and hexene
C. Propanal and propanone
D. All of these

Explanation

To determine which set of compounds have the same molecular formula, we will analyze the molecular formulas of the given compounds step by step.

### Step 1: Identify the Compounds
Let's identify the compounds mentioned in the question. The compounds we need to analyze are:
1. Butane
2. Isobutane
3. Cyclohexane
4. Hexene
5. Propanal
6. Propanol

### Step 2: Determine the Molecular Formula of Each Compound

1. **Butane (C4H10)**:
- Butane is an alkane with 4 carbon atoms.
- The general formula for alkanes is CnH(2n+2).
- For n = 4: C4H(2*4 + 2) = C4H10.

2. **Isobutane (C4H10)**:
- Isobutane is a structural isomer of butane and also has 4 carbon atoms.
- Therefore, its molecular formula is also C4H10.

3. **Cyclohexane (C6H12)**:
- Cyclohexane is a cyclic alkane with 6 carbon atoms.
- Using the formula for alkanes: CnH(2n+2).
- For n = 6: C6H(2*6 + 2) = C6H12.

4. **Hexene (C6H12)**:
- Hexene is an alkene with 6 carbon atoms and one double bond.
- The general formula for alkenes is CnH(2n).
- For n = 6: C6H(2*6) = C6H12.

5. **Propanal (C3H6O)**:
- Propanal is an aldehyde with 3 carbon atoms.
- Its molecular formula is C3H6O.

6. **Propanol (C3H8O)**:
- Propanol is an alcohol with 3 carbon atoms.
- Its molecular formula is C3H8O.

### Step 3: Compare the Molecular Formulas
Now, let's summarize the molecular formulas we have derived:
- Butane: C4H10
- Isobutane: C4H10
- Cyclohexane: C6H12
- Hexene: C6H12
- Propanal: C3H6O
- Propanol: C3H8O

### Step 4: Identify Sets with the Same Molecular Formula
From our analysis:
- Butane and Isobutane both have the molecular formula C4H10.
- Cyclohexane and Hexene both have the molecular formula C6H12.
- Propanal and Propanol do not have the same molecular formula.

### Conclusion
The sets of compounds that have the same molecular formula are:
1. Butane and Isobutane (C4H10)
2. Cyclohexane and Hexene (C6H12)