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Per NCERT §4.6.3, why are the AXIAL P-Cl bonds in PCl₅ slightly LONGER (and weaker) than the equatorial ones?
AAxial bonds are π only
BEach axial bond pair has 3 equatorial bp's at 90° (more repulsion) vs each equatorial which has only 2 axial neighbours at 90°
CCl atoms are smaller axially
DAxial bonds use d-orbitals only
Answer & Solution
Correct answer: B. Each axial bond pair has 3 equatorial bp's at 90° (more repulsion) vs each equatorial which has only 2 axial neighbours at 90°
Per NCERT §4.6.3, axial bps face 3 equatorial bps at 90° → greater repulsion → axial bonds longer + weaker → PCl₅ reactive.
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