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Chemistry Question 62 – NEET-UG 2025

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Given below are two statements : Statement I : A hypothetical diatomic molecule with bond order zero is quite stable. Statement II : As bond order increases, the bond length increases. In the light of the above statements, choose the most appropriate answer from the options given below :

Bond order is a measure of the number of chemical bonds between two atoms. It is directly related to the stability and strength of the bond.

Step 1: Evaluate Statement I✦ Active

Statement I says: "A hypothetical diatomic molecule with bond order zero is quite stable." Bond order zero implies that there is no net chemical bond between the atoms. Molecules with zero bond order (e.g., He2) are generally unstable or do not exist as stable entities under normal conditions, as there are no strong attractive forces holding the atoms together. Thus, Statement I is false.

Step 2: Evaluate Statement II○ Expand

Statement II says: "As bond order increases, the bond length increases." Bond order is inversely proportional to bond length. As the bond order increases (e.g., from a single bond to a double bond to a triple bond), the bond becomes stronger and shorter due to increased electron density between the nuclei. For example, C-C bond length > C=C bond length > C≡C bond length. Thus, Statement II is false.

Step 3: Conclusion○ Expand

Since both Statement I and Statement II are false, the most appropriate answer is option (2).

💡 Teacher's Secret Hint

Remember the inverse relationship between bond order and bond length, and the direct relationship between bond order and bond stability.

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