A molecular fragment derived by removing a methyl hydrogen from propene (-CH2-CH2=CH2). For example, "allyl chloride" is 3-chloropropene, Cl-CH2-CH2=CH2.
The change in enthalpy for the process
A(g) -> A(aq)
where the concentration of A in the aqueous solution approaches zero. Enthalpies of hydration for ions are always negative ...
