why nitrile are least reactive of carboxylic acid derivative
Answer / jyothi
Because nitrogen is less electronegative than oxygen, and so the nitrile carbon is far less electron-deficient than it is in a carbonyl group.
You see a similar effect when comparing the boiling points of methanol (65 C) with methanamine (-6 C). Oxygen-hydrogen bonds are more polar than nitrogen-hydrogen bonds, and so there is stronger hydrogen bonding between methanol molecules than between methanamine molecules.
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