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H-C-H bond angle in Methanol (Ch3OH)???

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    The answer said it's 109.5 degrees. How though? Surely, it's something like 120, or 116??? Help please!
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    The central carbon atom has 4 bonding pairs (the 3 hydrogens and the oxygen), causing it to form a 3D tetrahedral shape which has bond angles of roughly 109.5.
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    (Original post by Perfection Ace)
    The answer said it's 109.5 degrees. How though? Surely, it's something like 120, or 116??? Help please!
    Carbon in methanol has 4 bonding pairs, no lone pairs and so they repel equally. Therefore, the bond angle is 109.5* (a tetrahedral shape).
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    You have to look at each 'central' atom individually, the H-C-H has a carbon in the center and if we look at only the carbon it has 4 bond pairs, no lone pairs and hence a tetrahedral structure for the CH3O part, leading to 109.5 degrees.
 
 
 
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Updated: October 2, 2016
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