Question:
H-X mean single bond enthalpy is maximum when X is:
H-X mean single bond enthalpy is maximum when X is:
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Bond enthalpy is maximum when the bond is shortest and strongest; for H-X, this occurs with fluorine.
Updated On: Jun 19, 2026
- O
- F
- Cl
- I
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the trend in bond enthalpy.
The H-X bond enthalpy depends on the bond strength, which increases as the bond becomes shorter and stronger.
Step 2: Consider the size of halogen atoms.
Atomic radius decreases across the period, increasing bond strength.
Step 3: Compare bond lengths.
H-F has the shortest bond length among H-halides because F is small.
Step 4: Electronegativity effect.
F is highly electronegative, which strengthens the H-F bond.
Step 5: Compare with other H-X bonds.
H-Cl, H-Br, H-I have progressively weaker bonds due to larger atomic sizes.
Step 6: Conclusion.
The H-F bond has the maximum single bond enthalpy.
The H-X bond enthalpy depends on the bond strength, which increases as the bond becomes shorter and stronger.
Step 2: Consider the size of halogen atoms.
Atomic radius decreases across the period, increasing bond strength.
Step 3: Compare bond lengths.
H-F has the shortest bond length among H-halides because F is small.
Step 4: Electronegativity effect.
F is highly electronegative, which strengthens the H-F bond.
Step 5: Compare with other H-X bonds.
H-Cl, H-Br, H-I have progressively weaker bonds due to larger atomic sizes.
Step 6: Conclusion.
The H-F bond has the maximum single bond enthalpy.
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