9. Consider the substitution reaction of H2S?BH3 with NH3, which generates two product molecules (ignore
the states of matter), assuming that no species exceeds the octet rule. Given the following information:
Step 1: There are two products in the first step; one product, which is an intermediate, has a trigonal
planar molecular geometry.
Step 2: The intermediate from Step 1 reacts in Step 2 to form a compound with two sp3 hybridized atoms.
Overall: One bond is formed and one bond is broken. One of the products has a bent molecular geometry
and smells like rotten eggs.
(a) Propose a mechanism for this reaction. (b) Draw the Lewis structures of both products,
including all lone pairs and formal charges.