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What is the bond angle in ammonia molecule?(a) 106.5°(b) 107°(c) 108°(d) 109.5°This question was addressed to me during an online interview.This question is from Structure of Amines topic in division Amines of Chemistry – Class 12

Answer»

Right choice is (b) 107°

For explanation: The bond angle for a STANDARD TETRAHEDRAL GEOMETRY is 109.5°. But the ammonia molecule contains a lone electron pair on nitrogen. As it is closer to the N atom than the other orbitals, it creates a repulsive EFFECT and PUSHES the Hydrogen atoms close to each other, thus reducing the bond angle to 107°.



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