how-does-deprotonated-pyridine-initiate-nucleophilic-attack-on-an-aldehyde

Question

How does deprotonated pyridine initiate nucleophilic attack on an aldehyde?

Accepted Answer

By donating an electron pair to the carbonyl carbon

Answer

By substituting the carbonyl oxygen

Answer

By abstracting a proton from the carbonyl oxygen

Answer

By forming a covalent bond with the carbonyl oxygen