Which of the given compounds may exist as two or more isomeric forms? Give the strutures and names of the possible isomers.
(1) `CHBr_(3)`
(2) `C_(2)H_(2)CI_(4)`
(3) `C_(3)H_(3)`
(4) `C_(2)H_(5)F`
(5) `C_(2)H_(4)Br_(2)`
(6) `C_(6)H_(4)CI_(2)`

Explanation

(1) NO isomer is possible,
(2) Two isomers are possible : `CICH_(2)C CI_(3)` (1,1,1,2 - tetrachlorethane), `CI_(2)CHCHCI_(2)` (1,1,1,1 - tetrachloroethane),
(3) NO isomer is possible,
(4) NO isomer is possible,
(5) Two isomers are possible : `CH_(3)CHBr_(2)` (1,1 - dibromoethane),
(6) Three isomers are possible: