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A table of A-values indicate that $\ce{Br}$ substituent on a long chain organic molecule has relatively less steric effect than that of $\ce{Me}$- or $\ce{Et}$-group ($1.7$ and $\pu{1.75 kcal mol-1}$, respectively compared to $\pu{0.38 kcal mol-1}$ for $\ce{Br}$), and even smaller than that of $\ce{Cl}$ ($\pu{0.43 kcal mol-1}$), probably due to longer \$\ce{C-...