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Organic Chemistry

Cool goIITian

Joined:	9 Oct 2007
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14 Oct 2007 20:27:01 IST

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414

WHich has a higher +R Effect ???

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PHenol C6h5OH or C6H5 O Ch3 ?????? Guys plz help me.........Will rate if u help.................

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shivram kashyap

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Joined: 19 Sep 2007

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14 Oct 2007 21:10:00 IST

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-OH gp is a better +R gp than -OCH3 the OC bond is stronger than the OH bond so doesnt allow O to have 3 bonds in resonance even the steric effects of CH3 can affect the resonance effect

arun-rashi

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Joined: 19 Oct 2006

Posts: 1057

14 Oct 2007 23:27:26 IST

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--OH have higher +Reffect than -OCH3 because there is steric hindrance of lone pair in alkoxy group so it gives less activating effect in benzene ring.most activating effect to benzene ring is -NH2 group.

viswesh Nrayanan

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Joined: 9 Oct 2007

Posts: 73

15 Oct 2007 09:15:34 IST

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Waht abt chlorobenzene?????? i think its deactivating anh there is -I effect........

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