Table 6.

Summary of observed and calculated bond dissociation energies

Bond	Dissociation energy (eV)
	Observed	Calculated a
D0(H–Cl)	4.37	b4.43
D0(H–Cl+)	4.64.	b4.48
D0(CH3–F)	6.30(ion-netural)	c4 66
	6.17 (ion-pair)
$D_0\left({\text{CH}}_3^{+}-\text{F}\right)$	3.75	2.00
D0(CH2F+–H)	0.87
D0(CH3–Cl)	4.03 (ion-neutral)	3.49
	3.84 (ion-pair)
$D_0\left({\text{CH}}_3^{+}-\text{Cl}\right)$	2 59	1.96
D0(CH3–Br)	2 93	2.90
$D_0\left({\text{CH}}_3^{+}-\text{Br}\right)$	2 24	2.22

^aCalculated from usual summation of heats of formation given in ref. 24.

^bReported in ref. 25.

^c$\Delta H{f}_0^{°}\left({\text{CH}}_{\text{3}}\text{F}\right)=-55$ kcal mol⁻¹ from ref. 27.