The experimental techniques and theoretical considerations developed in the previous parts have been utilized in obtaining data on the reactions of the type H + CnH2n = CnH2n+1. The olefines used were ethylene, propylene, iso-butene, n-pentene-2 (cis), and 2, 3, 3, tri-methyl-butene-1. Certain tentative suggestions as to the effect of structure on the reactivity of the double bond are put forward, but in general, the collision efficiency of a hydrogen atom with an olefine lies between 10–3 and 10–4. It is noted that in the computation of the collision efficiency, it seems to be rather unsatisfactory that the diameter of the whole molecule should be used and it is suggested that perhaps the effective diameter of a more intimate part of the molecule in the region of the double bond should be employed.
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Melville et al. (1949) studied this question.