Assertion (A): Among the two O–H bonds in H2O molecule, the energy required to break the first O–H bond and the other O–H bond is the same.
Reason (R) : This is because the electronic environment around oxygen is the same even after breakage of one O–H bond.
(1) A and R both are correct, and R is correct explanation of A.

(2) A and R both are correct, but R is not the correct explanation of A.
(3) A is true but R is false.
(4) A and R both are false.

Answer: Option 4
Explanation:
The assertion (A) is false because the energy required to break the first O-H bond in H2O is different from the energy required to break the second O-H bond. This is because the electronic environment around the oxygen atom changes after the first O-H bond is broken. The remaining O-H bond experiences a greater effective nuclear charge from the oxygen nucleus, which makes it more difficult to break.
The reason (R) is also false because it contradicts the assertion. The electronic environment around the oxygen atom is not the same after the breakage of one O-H bond, which means that the energy required to break the remaining O-H bond is different.

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