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The ionic resonance energy of C-H bond i...

The ionic resonance energy of `C-H` bond is `~~ 6.0kcal mol^(-1)`. The `EN` of `H` is `2.1`. Calculate `EN` of carbon ? Given : `Delta_(C-H) ~~ 6.0 kcal mol^(-1)`

Text Solution

Verified by Experts

Percentage of ionic character in `H-F`
`(chi_(F) - chi_(H)) = 4.0 - 2.1 = 1.9`
`= [16 xx 1.9 + 3.5 xx (1.9)^(2)] = 43`
`%` ionic character in `H-Cl`
`(chi_(Cl) - chi_(H)) = 3.0 - 2.1 = 0.9`
`= [16 xx 0.9 + 3.5 xx (0.9)^(2)] = 17.2`
`%` of ionic character in `HBr`
`(chi_(Br) - chi_(H)) = 2.8 - 2.1 = 0.7`
`=[16 xx 0.7 + 3.5 xx (0.7)^(2)] = 12.9`
`%` ionic character in `HI`
`(chi_(I) - chi_(H)) = 2.5 - 2.1 = 0.4`
`= [16 xx 0.4 + 3.5 xx (0.4)^(2)] = 7.0`
`%` of ionic character `= HF gt HCl gt HBr gt HI`
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