JEE Advanced 2016 Chemistry question

According to Molecular Orbital Theory,

(A) is expected to be diamagneticCorrect
(B) is expected to have a longer bond length than
(C) and have the same bond orderCorrect
(D) has the same energy as two isolated He atoms

Answer: (A),(C)

Solution

(A) has 14 electrons, isoelectronic with : all electrons paired, diamagnetic: true. (B) (14 electrons) has bond order 3, higher than (bond order 2), so its bond is shorter: false. (C)

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Question ID VK-026562