CH3+Br. CCI CH3C(CH2)3CHO 21. C2As-CC-C2Hs KMnO OH (CH3+B2 HHH H3 B +O3O4 H,O C6H5 CH=CH, 25 ROOR C6H5 CHCH OH 26. CH LC=CH, (1)O3 CHs O (2)Zn/H-0 CH5C=0+H-C-H 27. F3CCHCH2+HI- F3CCH2 CHI CH,- -CH H,O2/OH OCH, H,OH (CH3)=CH, +IC1-H-,(CH3)2CHCICH2I ACH3 +H,SO A OSO3H: OH7 19 ． C H 3 ＋ B r2 C C l 4 B r C H 3 B r ( ± ) 20 ． ( 1 ) ( 2 ) O 3 Z n / H 2 O C H 3 C C H O O C H 3 ( C H 2 ) 3 21 ． KMn O 4 O H H C 2 H 5 C C 2 H 5 H C H O H H O C 2 H 5H C 2 H 5 ( ± ) 22 ． H 2 O 2 C H 3 ＋ B 2 H 6 O H C H 3 OH or C H 3 O H 23 ． B r ＋ 2 C C l 4 B rB r ( ± ) 24 ． C H 3 H2 O ＋ C H 3 O s O 4 N a H S O 3 C H 3 C H 3 O H O H 25 ． C H C H2 HB r C 6 H 5 RO O R C 6 H5 CH2 CH2 OH 26 ． ( 1 ) ( 2 ) O 3 C H 2 Z n / H 2 O C 2 H 5 C C H 3 H C 2 H 5 C ＋ CO C H 3 O H 27 ． F3 C CH=CH2 ＋ HI F C H 2 C H 2 I 3 C 28 ． C H 2 C H 2 H 2 O 2 O H B 2 H 6 HO C H2 C H 2 O H 29 ． C H2 H + C ＋ I C l ( C H3 ) 2 CH2 ( C H 3 ) 2 C H C l I 30 ． H2 S O 4 H 3 O + C H 3 ＋ OSO3H CH3 ； OHCH3