Ch3 ch3 ch3 ch2ci ch2 ch2ci ch2ci. Ch3-ch-ch-c=c-ch-ch3. ch3 c.h, ch,- c-ch,-ch-ch-ch,-ch, ch, ch2 ch3 ch3. ch3 - c c - ch - ch - ch2 - ch3. ch2 ch ch2 c c ch2 ch2 ch3.