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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Jyoti Chaudhary posted an Question
September 15, 2020 • 20:58 pm
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30 points
30 points
- CSIR NET
- Chemical Sciences
Order of basicity and nucleophilicity among fluoride chloride bromide and iodide
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Amol ashok pawar![best-answer]()
Fuorine is the most electronegative halogen element, but is the least stable, and the most basic. It turns out that when moving vertically in the periodic table, the size of the atom trump its electronegativity with regard to basicity. The atomic radius of iodine is approximately twice that of fluorine, so in an iodine ion, the negative charge is spread out over a significantly larger volume therefore, effective nuclear charge decreases. Overall order of basicity is F>Cl>Br>I I⁻ is a better nucleophile than F⁻ in polar protic solvents. I⁻ > Br⁻ > Cl⁻ > F⁻ F⁻ is a better nucleophile than Br⁻ in polar aprotic solvents.
nucleophilicity?
in protic solvents methoxy is higher, in a protic solvents F is gigher than methoxy
in protic solvent will there be hydrogen bonding.
please reply last quesn
will there be hydrogen bonding in protic solvent
depends on presence of a hetero atom such as O N S P
in the above case methoxy anion in protic solvent there will be chance of hydrogen bonding then what will be the order for nucleophilicity kindly reply
sure it will contribute to intramolecular hydrogen bonding thus in protic solvent it has higher nucleophilicity
ok sir thank you finally.
hope this helps, happy learning
ok
which forms better hydrogen bonds between oxygen and fluorine
fluorine as it is of higher electronegativity individually . and if you asking intramolecular hydrogen bonding then oxygen
ok from intramolecular point of view it will be methoxy otherwise fluorine anion is this correct/?
yes
ok sir thank you so much.