Bond Order 2 Molecules | JEE Main PYQ Q123 | Chemical Bonding
Q123. Number of molecules having bond order 2 from the following molecules is _________.

C2, O2, Be2, Li2, Ne2, N2, He2

Correct Answer: 2

Explanation

Bond order is calculated using Molecular Orbital Theory:

Bond order = (Number of bonding electrons − Number of antibonding electrons) / 2

Molecule Bond Order
C22
O22
Be20
Li21
Ne20
N23
He20

Molecules having bond order equal to 2 are:

C2 and O2

Hence, total number of such molecules is 2.

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JEE Main Chapter-wise PYQs – Chemistry

Updated for JEE Main 2026: This PYQ is important for JEE Mains, JEE Advanced and other competitive exams. Practice more questions from this chapter.

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