1) According to molecular orbital theory, which of the following will not be a viable molecule? A) $He_{2}^{2+}$ B) $He_{2}^{+}$ C) $H_{2}^{2-}$ D) $H_{2}^{-}$ Answer: Option CExplanation:Key Idea According to M.O.T . the viability of any molecule can be judged through the calculation of bond order. The molecule having ero bond order will not be viable hence, $H_{2}^{2-}$(option c) is the correct answer
