Question

Which molecule contains a total of seven carbon atoms?

2-methyl-heptyne
2-methyl-propane
3-methyl-2-hexene
3-methyl-1-pentene

Answer 1

3-Methylhex-2-ene

Step-by-step explanation:

You count the atoms in the stems of the names and add them up.

C. 3-Methylhex-2-ene

Methyl = 1C

Hexene = 6C

Methylhexene = 7C

A. 2-Methylhept-1-yne is wrong. It has 1C + 7C = 8C

B. 2-Methylpropane is wrong. It has 1C + 3C = 4C

D. 3-Methylpent-1-ene is wrong. It has 1C + 5C = 6C