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Assertion (A) :
Among the two $O - H$ bonds in $H_{2} O$ molecule, the energy required to break the first $O - H$ bond and the other $O - H$ bond is different.
Reason (R) :
This is because the electronic environment around oxygen is different after breakage of one $O - H$ bond.

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If Both A and R both are false

If both A and R both are correct and R is the correct explanation of A

If both A and R both are correct, but R is not the correct explanation of A

If A is true, but R is false

answer is A.

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Detailed Solution

Correct assertion The bond enthalpies of the two $O - H$ bonds in $H - O - H$ are not equal.
Correct reason This is because electronic environment around O in not same after breakage of one $O - H$ bond

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