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

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    • Thread Starter

    The answer said it's 109.5 degrees. How though? Surely, it's something like 120, or 116??? Help please!

    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.

    (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).

    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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