1the more the electronegativity the more polar and unstable the bond
but the bond length factor overpowers electronegativity !
What effect does electronegativity difference between bonded elements have on bond strength ?
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11 Answers
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29@Ishan..i dont agree with ur answer completely..
as in the case of HF and HI...the electronegativity difference b/w H and F is more as compared to the electronegativity difference b/w H and I..so according to ur explanation bond in HI shud be stronger as compared to the bond in HF..but the reverse is true..and ya i know that's bcoz of the different bonding orbitals...but ur statement doesnt fit in this case..
39I- is a very stable conjugate base(due to large size of I, negative charge is spread out) so HI is a strong acid(strongest halogen acid if I remember correctly). Anomalies will always be there govind...yeh chemistry hai aakhirkaar!
1@ govind please make the effort of reading the complete post before commenting!
i have mentioned that bond length overpowers polarity!
HF bond is the shortest amongst the halogen acids and hence the strongest!
once u have two bonds same length(approx) the one which is more polar will be more vulnerable
reason: the cnjugate species will be more stable as mentioned by pritish!
4@Ishan : A Doubt
" " the more the electronegativity the more polar and unstable the bond
but the bond length factor overpowers electronegativity " "
By this u mean that Bond strength of polar > non polar no ???
(Correct me if I 'm wrong)
1no uttara
what i mean is that for the same group of elements we consider the bond length whereas for other cases we consider the polar nature!
1more the electronegativity difference stronger is the bond in general cases but with that u can't say NaCl has bond energy more than N2 inspite of NaCl has a greater electronegativity difference.
1HIGHER El. Diff. results in ionic bond and lower gives cov. bond. Ionic bonds are stronger than cov. bonds.
4@Ishan
" " for other cases we consider the polar nature! " '
My doubt was regarding this
While considering polar nature Bond strength of polar > non polar
Am I right ????
1no uttara when we consider polar nature:
bond strength of polar<non polar
reason: the more polar the more the chances of substitution rxn and elimination as the case may be.