What is the correct bond angle in dimethyl ether?
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Let us compare the C−O−CC−O−C bond angle in dimethyl ether (110.3°) with H-O-H bond angle in H2OHX2O (104.5°).
The bond angle in dimethyl ether is greater due to the following reason. The CH3CHX3 functional group is many times heavier than the H atom (both act as side atoms). So the effect of lone pair - lone pair repulsion in H2OHX2O is pronounced in H2OHX2O whereas due to heavy molecular weight the repulsive forces aren't able to fully force CH3CHX3 functional groups to compress them
The bond angle in dimethyl ether is greater due to the following reason. The CH3CHX3 functional group is many times heavier than the H atom (both act as side atoms). So the effect of lone pair - lone pair repulsion in H2OHX2O is pronounced in H2OHX2O whereas due to heavy molecular weight the repulsive forces aren't able to fully force CH3CHX3 functional groups to compress them
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