(d)(Z)-4,4-Dimethyl-2-pentene; 4650 kJ/mol (1111.4 kcal/mol). Disubsti-tuted double bond, but destabilized by van der Waals strain.(b)2,4-Dimethyl-1-pentene; 4638 kJ/mol (1108.6 kcal/mol). Disubstituteddouble bond.(c)2,4-Dimethyl-2-pentene; 4632 kJ/mol (1107.1 kcal/mol). Trisubstituteddouble bond.5.28(a)1-Methylcyclohexene is more stable; it contains a trisubstituteddouble bond, whereas 3-methylcyclohexene has only a disubstituted double bond.(b)Both isopropenyl and allyl are three-carbon alkenyl groups: isopropenyl is CH2?CCH3, allylis CH2?CHCH2@.gIsopropenylcyclopentane has a disubstituted double bond and so is predicted to be more sta-ble than allylcyclopentane, in which the double bond is monosubstituted.(c)A double bond in a six-membered ring is less strained than a double bond in a four-memberedring; therefore bicyclo[4.2.0]oct-3-ene is more stable.
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