Answer true or false.
(a) Complete combustion of an alkene gives carbon dioxide and water.
(b) Addition reactions of alkenes involve breaking one of the bonds of the carbon–carbon double bond and formation of two new single bonds in its place.
(c) Markovnikov’s rule refers to the regioselectivity of addition reactions of carbon–carbon double bonds.
(d) According to Markovnikov’s rule, in the addition of HCl, HBr, or HI to an alkene, hydrogen adds to the carbon of the double bond that already has the greater number of hydrogen atoms bonded to it and the halogen adds to the carbon that has the lesser number of hydrogens bonded to it.
(e) A carbocation is a carbon atom with four bonds that bears a positive charge.
(f) The carbocation derived from ethylene is CH3CH2+.
(g) The reaction mechanism for the addition of a halogen acid (HX) to an alkene is divided into two steps, (1) formation of a carbocation and (2) reaction of the carbocation with halide ion, which complete the reaction.
(h) Acid-catalyzed addition of H2O to an alkene is called hydration.
(i) If a compound fails to react with Br2, it is unlikely that the compound contains a carbon– carbon double bond.
(j) Addition of H2 to a double bond is a reduction reaction.
(k) Catalytic reduction of cyclohexene gives hexane.
(l) According to the mechanism presented in the text for acid-catalyzed hydration of an alkene, the H and -OH groups added to the carbon– carbon double bond both arise from the same molecule of H2O.
(m) The conversion of ethylene, CH2wCH2, to ethanol, CH3CH2OH, is an oxidation reaction.
(n) Acid-catalyzed hydration of 1-butene gives 1-butanol. Acid-catalyzed hydration of 2-butene gives 2-butanol.
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