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Identification of `+m` & `-m` groups : If the first atom of the group has lone pair or negative charge shows `+m` effect. `+m` group increases electron density at ortho and para position of benzene ring. If the group has vacant `p-`orbital on first atom, also a multipal bonded group in which second atom is more electronegative than the first then it shows `-m` effect. `-m` group decreases electron density of ortho and para position of benzene ring. Identify which of following group/s show `-m` effect when attached with benzene ring.A. `-NH_(2)`B. `-O^(ɵ)`C. `-overset(O)overset(||)(C)-overset(O)overset(||)(C)-CH_(3)`D. `-overset(O)overset(||)(C)-NH-CH_(3)` |
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Answer» Correct Answer - C::D `-oversetoverset(O)(||)C-NH-CH_(3)` and `-oversetoverset(O)(||)C-oversetoverset(O)(||)C-CH_(3)` do not contain lone pair of electron negative charge on first atom. |
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