Question

Give the name of the following molecule. A compound with a total of six carbons with a double bond and the rest single bonds. There is a chain of five carbons across the bottom with a double bond between the third and fourth carbons when counting form left to right. There in a methyl group branching off of the middle carbon.

Answer 1

Answer:
            The name of given molecule is 3-Methylpent-2-ene.

Explanation:
                   First of all a carbon chain of five carbons was drawn. Then a double bond was made between carbon 3 and 4 (starting from left). A methyl group was drawn at middle carbon which is at position 3.

                    Molecule sketched was named as,

1) A longest chain containing double bond was selected and numbering was started from the end closest to double bond. Hence, 

                                  2-Pentene or Pent-2-ene

2) The position of substituent was specified before the parent name, Hence,

                       3-Methyl-2-Pentene or 3-Methylpent-2-ene