3.CH一CH=CH2+HC CH3- CH— CH3 cI COOH CH3 4. +KMnO4 C(CH3)3 C(CH3)3 Br 5.CH3一C三CH+HBr CH3— C CH3 Br3. C H 3 C H C H 2 + HC l 4. C H 3 + KM n O 4 C ( C H 3 ) 3 C H 3 C H C H 3 Cl C O O H C ( C H 3 ) 3 5. C H 3 C C H 3 B r B r C H 3 C C H + HB r