The hydrogen atom and its electrons are moved to the carbonyl carbon on the aldehyde or ketone, which is why the answer is C. Hydride.
One of the lone pairs on the oxygen atom of an aldehyde or ketone can be sufficiently attracted to one of the slightly positive hydrogen atoms in a water molecule for a hydrogen bond to form.
Aldehydes and ketones go through a number of reactions that produce a wide range of end products. The most frequent reactions are nucleophilic addition reactions, which result in the creation of cyanohydrins (RCH(OH)C&tb), alcohols, alkenes, diols .
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