for each pair of structure shown below indicate two species are identical molecules.
1) Identical Molecules
3) Constitutional Isomers
1( identical
2)identical
3)costitutional
4)enantiomers
5) and 6) identicals
thnx
To determine which pairs of structures indicate identical molecules, we need to compare the structural formulas and determine if they have the same connectivity of atoms. Let's examine each pair and identify the identical molecules:
1. **Pair 1:**
- Structure 1: CH3-CH2-CH3
- Structure 2: CH3-CH2-CH2-H
In this case, the two structures are not identical because they have a different number of hydrogen atoms bonded to the carbon atoms. Thus, the molecules represented by Structure 1 and Structure 2 are different.
2. **Pair 2:**
- Structure 3: CH3-CH(CH3)-CH3
- Structure 4: CH3-CH2-CH2-CH3
These structures represent the same molecule, propane (C3H8). Both structures have the same connectivity of atoms and contain the same number of carbon and hydrogen atoms. Therefore, the molecules represented by Structure 3 and Structure 4 are identical.
3. **Pair 3:**
- Structure 5: CH3-CH2-CH2-OH
- Structure 6: CH3-CH(CH3)-OH
These structures represent two different molecules. Structure 5 represents 1-propanol (C3H8O), which is an alcohol. Structure 6 represents 2-propanol (C3H8O), also known as isopropanol, which is a different alcohol. The position of the hydroxyl (-OH) group is different in these two compounds, making them distinct molecules.
In summary, the identical molecules in the given pairs of structures are:
- Pair 2: Structure 3 and Structure 4, both representing propane (C3H8).