Question

Which of the following molecules contains 2 types of bond lengths?
1) PCl5
2) XeF4
3) SF6
4) CF4​

Answer 1

Explanation:

the correct answer is

2)XeF4

Answer 2

The correct option for the molecule that contains two types of bond length is 1) PCl5

• The molecules which have unequally distributed lone pair of electrons contains two types of bond lengths because lone pairs causes distortion or repulsion in the molecule which results in unequal bond lengths.
• SF6 and CF4 contain only one type of bond length because of no lone pairs and symmetrical geometry.
• The geometry of SF6, and CF4 is trigonal pyramidal, octahedral and tetrahedral.
• The shape of the XeF4 molecule is square planar and contains 2 lone pairs. These 2 lone-pairs cause equal repulsion and the net effect is no change in bond length.
• PCl5 has no lone pair but still has unequal bond length due to trigonal bipyramidal geometry. The structure of PCl5 has 2 axial and 3 equatorial bonds. 2 chlorine atoms present axially and the other 3 chlorine atoms equatorially. Axial bonds are longer than equatorial bonds.

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