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The toxicity of alkenes with the same carbon number is expected to be similar, irrespective of the positioning of the double bond. The reason for this is that these alkenes are neutral organic hydrocarbons which act via non-polar narcosis. The acute toxicity observed is due to the uptake of the chemical (proportional to log Kow) and then disruption of the function of biological membranes. Alkenes with the same carbon number have very similar log Kow and therefore would be expected to have similar toxicities. Data are therefore read across between alpha and internal alkenes.