Sodium triacetoxyborohydride , is a mild reducing agent that reduces aldehydes much more...

Sodium triacetoxyborohydride , is a mild reducing agent that reduces aldehydes much more quickly than ketones. It can be used to reduce aldehydes in the presence of ketones, such as in the following reaction:

(a) Draw a complete Lewis structure for sodium triacetoxyborohydride.

(b) Propose a mechanism for the reduction of an aldehyde by sodium triacetoxyborohydride.