Lewis and Bronsted acids accelerate processes by binding to nucleophilic sites in molecules and activating the molecule to nucleophile attack.
The electron-pushing mechanism for the reaction by drawing the necessary organic structures and curved arrows for each step is drawn in the image attached. The final products are represented in the image. The negatively charged oxygen is more nucleophilic and thus removes deuterium from deuterated water. Electrons are moving from the negatively charged oxygen to the deuterium, and then they continue to the deuterated oxygen. The electrophilic carbonyl carbon is attacked by the hydride ion from BH₄⁻ because it is a nucleophilic (electron-rich) species, which causes the electrons to go to the carbonyl oxygen.
Images are attached for the complete question and mechanism of a reaction.
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