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For which molecule(s) can we not use valence bond theory to explain the bonding?    SO2...


For which molecule(s) can we not use valence bond theory to explain the bonding?

   SO2 (O―S―O bond angle ~120

°

)
   CH4 (H―C―H bond angles = 109.5

°

)
   AsH3 (H―As―H bond angles = 92

°

)
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Answer #1

We can not explain the bonding in AsH3 by VBT.

As has five valence electrons. In AsH3 it is bonded to two three hydrogens. so three valence electrons will form three bonds with three hydrogens and one lone pair of electron will be left, unbonded.

So the electronic geometry should be tetrahedral. The molecular geometry may vary, with a slight deviation from tetrahedral bond angle of 1090 28', The deviation can be explained with the help of VBT considering bonding and nonbonding electrons interaction, however as given the bond angle is 920, which we can not justigy with the help of VBT as the deviation in bond angle is out of scope of VBT.

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Answer #2
AsH3. i had this on my homework and it said it was the correct answer. this is for the b*tches who are lazy and just want the answer. kisses
source: mama
answered by: your
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