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Tryptophan is less hydrophobic than phenylalanine and as a whole tryptophan is considered non polar although it has an additional N-H group at its side chain.. Look at the side chain of tryptophan which is more hydrophobic and large so if a tiny part (N-H) in its side chain is polar than still it can not influence the hydrophobicity of the entire side chain ...

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With hydroxyl groups, the oxygen is donating electron density into the ring (resonance). Additionally, the overlap between oxygen and carbon pi orbitals is sufficient enough to make up for the electronegativity of oxygen. Halogens also donate electron density, however, the orbitals do not overlap as well with halogens and carbon, causing less electron ...

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I read that chlorine is more reactive than oxygen despite being less electronegative I think that you read it wrong reactivity of an element is directly related to its ability to gain electron, so oxygen is champion in gaining electron because of its high electronegativity. $$\ce{CuO + 2 HCl -> CuCl2 + H2O}$$ now for this reaction, you do not require the ...

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