Comparisons with the early values

Later data are not as extensive with respect to the number of compounds investigated and, in general, it is appropriate to consider studies made by the same groups of workers for any series of compounds. This is necessary so that apparatus errors and individual errors in flame diameter measurements are kept constant. The relative rates can then be expected to give essentially correct reflections of the relative reactivities 

CfiHsF CgHjCl CeHjBr CgHjI (Tuck and Warhurst 

CF3F CF3CI - CF3Br CF3I (Warhurst and Whittle quoted 

No new comparisons are possible as no further comparable data have been obtained since 1932. 

The competitive technique [33, 34] gives the following relative values for the rate coefficients for alkyl chlorides reacting with potassium. Comparative figures from Polanyi s compilation [2] are given in brackets. 

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