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In the following question, an Assertion ...

In the following question, an Assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer.
Assertion : `H_2` molecule is more stable than HeH molecule.
Reason : The electron in antibonding orbital of the molecule destabilises it.

A

If both (A) and (R) are correct and (R) is the correct explanation of (A).

B

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

C

If (A) is correct, but (R) is incorrect.

D

If both (A) and (R) are incorrect.

Text Solution

Verified by Experts

The correct Answer is:
B
`H_2` molecule is more stable than HeH because bond order of `H_2 = 1` and that of `HeH = 1/2` (Higher the bond order, more is the stability).
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BRILLIANT PUBLICATION-CHEMICAL BONDING-LEVEL-II (ASSERTION-REASON TYPE)
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