Question

Why in pcl5 axial bonds is longer than equatorial bonds?

Answer 1

In PCl5, there are three equatorial bonds and two axial bonds. The axial bonds are longer than equatorial bonds because of greater repulsion from equatorial bonds.The 2 axial bonds are at 90° angle to the 3 equatorial bonds. while all 3 equatorial bonds are at 120° to each other. So axial bonds are nearer to equatorial bonds and this causes greater repulsion resulting elongation of bond length.

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Answer 2

In pcl5 the axial bonds suffers repulsion from the equatorial bonds so they become long .

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