Question:
Which of the following statements is WRONG?
Which of the following statements is WRONG?
Updated On: Apr 7, 2025
The bond order of He2is zero;so He2,molecule is unstable.
Li2 molecule is diamagnetic.
O2 molecule contains two unpaired electron and is paramagnetic.
C2 molecule is paramagnetic in vapour phase.
H2 molecule has no unpaired electrons.
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The Correct Option is D
Approach Solution - 1
Analysis of statements:
- (A) He₂: Correct (bond order = 0, unstable)
- (B) Li₂: Correct (σ1s²σ*1s²σ2s² configuration, diamagnetic)
- (C) O₂: Correct (π*2p¹π*2p¹ configuration, paramagnetic)
- (D) C₂: Wrong (σ1s²σ*1s²σ2s²π2p²π2p² configuration, diamagnetic)
- (E) H₂: Correct (σ1s², no unpaired electrons)
Thus, the correct option is (D): C₂ molecule is paramagnetic in vapour phase.
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Approach Solution -2
1. Analyze each statement:
- (A) The bond order of H2 is zero; so He2 molecule is unstable:
- This statement is Correct. The bond order has two electrons in the bonding molecular orbital and none in the antibonding orbital. For He2, the bond order is indeed zero because there are two electrons in the bonding orbital and two in the antibonding orbital, leading to instability. Thus, this statement contains a factual error about H2.
- (B) Li2 molecule is diamagnetic:
- This statement is correct. The Li2 molecule has all its electrons paired (two electrons in the bonding molecular orbital), making it diamagnetic.
- (C) O2 molecule contains two unpaired electrons and is paramagnetic:
- This statement is correct. The O2 molecule has two unpaired electrons in its π* antibonding molecular orbitals, making it paramagnetic.
- (D) C2 molecule is paramagnetic in vapour phase:
- This statement is incorrect. In the vapour phase, the C2 molecule has all its electrons paired (no unpaired electrons), making it diamagnetic, not paramagnetic.
- (E) H2 molecule has no unpaired electrons:
- This statement is correct. The H2 molecule has both its electrons paired in the bonding molecular orbital, making it diamagnetic.
- Statement (D) is also wrong because C2 is diamagnetic, not paramagnetic, in the vapour phase.
3. Final answer:
The WRONG statement is (A).
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