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Question
Why is the C-O bond length in phenols less than that in methanol?
Solution
The carbon-oxygen bond length in phenol (136 pm) is somewhat shorter than that in methanol. This is owing to the partial double bond character of the unshared electron pair of oxygen conjugated with the aromatic ring and the sp2 hybridised state of carbon to which oxygen is connected
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\[\ce{CH3 - CH = CH2 ->[H2O/H^+]}\]
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