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Is it a ionic or a covalent bond?

by jaumzaum
Tags: bond, covalent, ionic
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jaumzaum
#1
Jul22-13, 09:54 PM
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P: 248
In the compunds below, are the bonds most ionic or covalent?

CH3-Mg-Cl (Grignard reagent), C-Mg bond

[Ag(NH3)2]+ (Tollens' reagent), Ag-N bond

Thanks
John
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Seydlitz
#2
Jul22-13, 11:31 PM
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P: 255
For the Grignard reagent bond, C-Mg, I think it is covalent mostly. The electronegativity difference between C-Mg is not too significant. But it will be polar certainly.

For the Tollen's reagent, the bond between NH3 and Ag+ is that of dative covalent, because NH3 can be considered as ligand to Ag+
DanL
#3
Jul28-13, 07:17 PM
P: 16
For the Grignard reagent, the Mg-Cl bond is covalent, but the Mg-CH3 bond is ionic with the carbon carrying the negative charge and the Mg-Cl carrying the positive charge. This allows the lone pair on the carbanion to attack sites on other molecules containing a partial positive (such as carbonyls).


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