Section 185

On a reading of section 185 it appears that the section will not cover loan given by private company to public company unless the transaction falls in clause (d) and (e) of the explanation to the section. i,e in your case to hit by section 185, the director of A Pvt Ltd should hold at least 25 % of the B Ltd or the Board of B Ltd is accustomed to act in accordance with the directions of A Pvt Ltd. 

In my view, an act which is done prior to the commencemnet of an Act, which was perfectly legal in accordance with the earlier act, do not require any further compliances unless other wise specified in the new act. Since in the absence of any of such provisions in 2013 act, B Ltd can go ahead with the transaction.

Any other view is welcome....