Which of the following hydrides has the smallest H−X−H bond angle?
A
H2O
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B
H2S
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C
H2Se
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D
H2Te
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Solution
The correct option is CH2Te
H−X−H Bond
Angle
H−X Bond length
H2O
104o
96 pm
H2S
92o
134 pm
H2Se
91o
146 pm
H2Te
90o
169 pm
Bondangle∝electronegativity(EN)ofthecentralatom
as EN of O is maximum and EN of Te is minimum, the bond angle is maximum in case of H2O and minimum in case of H2Te
Due to more EN of Oxygen, electron cloud shifts towards it and thus leads to an increase in b.p-b.p repulsion. Tellurium exhibits minimum electronegativity, thus it possesses a minimum bond angle.