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C - C ≈ C - C - C - C
| |
C C
b.
C ≈ C - C - C - C
| |
C C
c. C
|
C - C ≈ C - C - C - C - C
| |
C C
l l
ch3 ch3
b. ch2=c - ch - ch2-ch3
l l
ch3 ch3
ch3
l
c. ch3-ch=c - c-ch2-ch2-ch3
l l
ch3 ch3