Question

Assertion: Standard enthalpy of isomerisation of enantiomer into the other is zero.
Reason: The two enantiomers of any chiral compound have the same enthalpy of formation.
A. Statement -$1$ is true, statement-2 is true and statement -$2$ is correct explanation for statement- $1$
B. Statement - $1$ is true, statement-2 is true and statement -$2$ is NOT the correct explanation for statement -$1$
C. Statement -$1$ is true, statement -$2$ is false.
D. Statement -$1$ is true, statement -$2$ is true.

Answer 1

Hint: Enantiomers are the class of isomers which are having non-superimposable mirror images. The molecular formula is the same but they have different spatial orientations in space. So the enthalpies need to be the same.

Complete answer:
We have been given the Standard enthalpy of isomerisation of enantiomers into the other is zero. An enantiomer is one of two stereoisomers that are mirror images of each other that are non-superposable (not identical).
We know that Standard enthalpy of isomerisation of an enantiomer into the other is zero. So two enantiomers of any chiral compound have the same enthalpy of formation.
And because of that standard enthalpy of isomerisation of enantiomers into the other is zero. So we know that enthalpy change is equal to the change in enthalpies of the given molecules and it is zero here.
So the standard enthalpy of isomerisation of enantiomer into the other is zero
So the statement is correct, the reason is correct and the reason is the correct explanation of the statement.

Hence, option A is the correct option..

Additional information:
Enantiomers are the non -superimposable mirror images. They are chiral molecules that are mirror images of each other. Also, the chiral molecules with one or more stereo centres can be enantiomers. It does not contain equal and opposite halves They have different orientations in space.

Note: Enantiomers are the class of isomers having non-superimposable mirror images along with diastereomers. The chiral compounds have the same enthalpy of formation and the change in enthalpy is zero.