Conformations are isomers of the same compound that have the same molecular formula, molecular weight, and connectivity of atoms, but can differ in energy. While conformations share these properties, they do not necessarily have the same energy, as some conformations are more stable than others due to small differences in rotational energy.

1. Please Explain
23. Which of the statements below is NOT true about conformations? A. They have the same
molecular formula C. They have the same molecular weight B. They have the same energy D.
They have the same connectivity of atoms
Solution
Ans 23 : B) They have the same energy
Since conformors are the isomers of the same compound , they will have the same molecular
formula. Now the molecular weight of the compound depends on its constituent atoms , since
here the molecular formula is same , so molecular weight will also be same.
They are stereoisomers and not structural isomers , so the connectivity of atoms is also same.
These isomers have little energy of rotation , so they can interconvert into each other very easily
and quickly , and some are more stable than the others.