Chemical Bonding And Molecular Structure Question 515

Question: Which has the least bond angle [NCERT 1973; DPMT 1990; CBSE PMT 1990; UPSEAT 2003]

Options:

A) $ NH_3 $

B) $ BeF_2 $

C) $ H_2O $

D) $ CH_4 $

Show Answer

Answer:

Correct Answer: C

Solution:

Due to $ lp-lp $ repulsions, bond angle in $ H_2O $ is lower $ (104^{o}{{.5}^{o}}) $ than that in $ NH_3 $

$ (107^{o}) $ and $ CH_4(109^{o}2{8}’) $ . $ BeF_2 $ on the other hand, has sp-hybridization and hence has a bond angle of $ 180^{o} $ .



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