Which of the following is the most stable Lewis acid–base adduct?
This is a question from KVPY 2016 examination. In my first attempt, I focused on the positive charge that is going to appear on the donating atom. So the less electronegative the donor, the better it is at donating its lone pair to the vacant orbital on boron. However, the answer key states that the answer is option (c).
I am unable to rationalize why (c) is the most stable adduct.