electronegativity calculation???

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[chemo11]

D(A-B)=1/2(D(A-A)+D(B-B))+23(kcal/mol)(Xa-Xb)^2 calculate electronegativity of C in C-H bonds of C2H6,C2H4,andC2H2 from bond dissociation energies below H3C-CH3 88 H-H 104 H-CH2CH3 98 H-CH=CH2 103 H-C=CH 125