CHEM HELP PLEASE?

All of the four names are incorrect.

2-ethylpropane should be 2-methypropane instead.
(The longest hydrocarbon chain has 4 carbon atoms.)

5-chlorocyclopentene should be 3-chlorocyclopentene instead.
(The bonding carbon atoms of the C=C double bond must be numbered as 1 and 2.)

1,2-dimethylcyclohexene should be 1,6-dimethylcyclohexene instead.
(The bonding carbon atoms of the C=C double bond must be numbered as 1 and 2, and the first branch should have lowest number.)

1-methylpropyne should be 2-butyne (U.S.) or but-2-yne instead.
(The longest hydrocarbon chain has 4 carbon atoms.)

This is the basics, if you dont figure this out, you wont understand the stuff after this...

1. 2-Methylbutane 2. Correct 3. 3-Chlorocyclopentene 4. 2-Butyne Pavel is correct -- you must master this QUICKLY!!


.