Which one of the following species would be least likely to act as Lewis base and why?
A. PCl3
B. CN-
C. SCl2
D. I+

Dear Student,

Please find below the solution to the asked query:

A Lewis base can be defined as an electron pair donor.
From the above options, I+ does not have a complete octet of electrons in its shell, hence it will rather gain two more electrons than lose its six electrons. Therefore, it is least likely to act as Lewis base.

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