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The shape of NH₃ is trigonal pyramidal with a bond angle of about 107°, whereas BF₃ is trigonal planar with bond angles of exactly 120°. The key reason for this difference is:
AN is more electronegative than B
BNH₃ is gaseous, BF₃ is liquid
CN–H bonds are stronger than B–F bonds
DN has a lone pair on the central atom; B does not
Answer & Solution
Correct answer: D. N has a lone pair on the central atom; B does not
BF₃ is AB₃ (no lone pair) → trigonal planar, 120°. NH₃ is AB₃E (one lone pair) → trigonal pyramidal; the lone pair pushes the three N–H bonds closer, reducing the angle to ~107°.
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