Q.

The intermolecular potential energy for the molecules A, B, C and D given below suggests that :

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a

A-D has the shortest bond length

b

D is more electronegative than other atoms

c

A-B has the stiffest bond

d

A-A has the largest bond enthalpy

answer is C.

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Detailed Solution

From the given graphs, we can understand that A-B bond is strongest and is stiffest bond. Since more the negative potential energy more the stability and more the bond is stable and more the energy needed.
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The intermolecular potential energy for the molecules A, B, C and D given below suggests that :