Identify the Lewis acid in this balanced equation: Central N is bonded above, left, and below to C H 3 and has 2 electron dots to the right. Plus. B is bonded above, below left, and below right to H. Right arrow. N superscript plus is bonded above, below, and left to C H 3, and to the right to B; the B is bonded above, below and right to H. N(CH3)3 BH3 (CH3)3N:BH3.