
Rotational angle required to get maximum stable conformer from minimum stable conformer in n-butane is:
1.
2.
3.
4.
Answer
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Hint: As we know that different conformations are the arrangement of two atoms in a molecule that are found to differ by rotation. And the study of energy between different conformations is called conformational analysis.
Complete Solution :
- By rotating the back carbon about axis by an angle of , the resulting conformation is called as Anti conformation or staggered conformation.
- We can see from the conformation drawn below:
- We can see from the above staggered conformation that all the groups on and carbons are maximum apart. Therefore, it is found that the torsional and the steric interactions are minimum. ( the bulkier two groups are at ).
- Hence, it is found that this is the most stable and the most preferred conformation of n-butane. Therefore, its potential energy is considered as zero and the energies of all other conformation is determined relative to this.
- Hence, we can say that the correct option is (1), that is the Rotational angle required to get maximum stable conformer from minimum stable conformer in n-butane is
So, the correct answer is “Option 2”.
Note: - We should note the main difference in between eclipsed and staggered conformation. In eclipsed conformation, the carbons are aligned in such a way that the hydrogens are lined up with each other.
- In staggered conformation atoms are found to be equally spaced from each other.
Complete Solution :
- By rotating the back carbon
- We can see from the conformation drawn below:

- We can see from the above staggered conformation that all the groups on
- Hence, it is found that this is the most stable and the most preferred conformation of n-butane. Therefore, its potential energy is considered as zero and the energies of all other conformation is determined relative to this.
- Hence, we can say that the correct option is (1), that is the Rotational angle required to get maximum stable conformer from minimum stable conformer in n-butane is
So, the correct answer is “Option 2”.
Note: - We should note the main difference in between eclipsed and staggered conformation. In eclipsed conformation, the carbons are aligned in such a way that the hydrogens are lined up with each other.
- In staggered conformation atoms are found to be equally spaced from each other.
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