6
Read the following statements-
(A) . Molecular conformation is defined as the spatial arrangement of atoms or the substituents groups
(B) . Molecular conformation can be changed without breaking any bond.
(C) . Ahydrocarbon, ethane has many interconvertible molecular conformations
(D) . All the conformations of ethane and other hydrocarbons can be easily isolated
(©). Of all, eclipsed conformation is the most stable and staggered is the least stable conformation.
Choose the correct answer from the options given below:
EXPLANATION
Amino Acids, Peptides, & Proteins
- Statement (A) is Correct: Molecular conformation refers to the spatial arrangement of atoms or functional groups in a molecule that can be interconverted purely by rotation about single bonds.
- Statement (B) is Correct: Conformational changes occur without the cleavage or formation of covalent bonds.
- Statement (C) is Correct: Ethane ($CH_3-CH_3$) possesses an infinite number of interconvertible torsional conformations between fully eclipsed and fully staggered extremes.
- Why (D) and (E) are Incorrect: Conformers of ethane interconvert millions of times per second across a minimal rotational energy barrier (~$12\text{ kJ/mol}$), making individual isolation impossible. The staggered conformer has minimum torsional strain and is the most stable, while the eclipsed conformer is the least stable.
- Conclusion: (A), (B), and (C) only are correct.
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