In the compound PClkF5−k, the possible values of k are 0 to 5. Then the sum of all possible value of k for the compounds having zero dipole moment is:
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Solution
Two molecules are possible. a) PCl5 k =5 b)PCl3F2 k = 3. Here, F occupies the axial position according to Bent's rule and Cl occupies the equatorial position. In both dipole vector cancels each other and hence the dipole moment will be zero. Sum = 5+3= 8