Question

what is the name of the following structure:
CH3-CHBr-CH-CCl-C2H5
I I
CH3 C2H5

Answer 1

What is the name of the following structure?

$$\begin{array}{c c c} \mathrm {C H} _ {3} - \mathrm {C H B r} - \mathrm {C H} - \mathrm {C C I} - \mathrm {C} _ {2} \mathrm {H} _ {5} \\ \mathrm {I} & \mathrm {I} \\ \mathrm {C H} _ {3} & \mathrm {C} _ {2} \mathrm {H} _ {5} \end{array}$$

Answer: This structure has a few mistakes. To show them, we will enumerate the main carbon chain:

$$\begin{array}{c c c c c} \stackrel {1} {C H} _ {3} - \stackrel {2} {C H B r} - \stackrel {3} {C H} - \stackrel {4} {C C I} - \stackrel {5} {C H} _ {2} - \stackrel {6} {C H} _ {3} \\ \stackrel {I} {C H} _ {3} & \stackrel {I} {C _ {2} H _ {5}} \end{array}$$

First mistake is, that second atom of carbon has 5 bonds (with first and third carbon atoms, methyl group and with hydrogen and bromine atoms). And the second is, that fourth atom of carbon has only 3 bonds (with third and fifth carbon atoms, and with chlorine atom). Every carbon atom always should have 4 bonds. The correct structure will be:

$$\begin{array}{c c c c} \mathrm {H} _ {3} \mathrm {C} - \mathrm {C H B r} - \mathrm {C H} - \mathrm {C C I} - \mathrm {C H} _ {2} - \mathrm {C H} _ {3} \\ \mathrm {I} & \mathrm {I} \\ \mathrm {H} _ {3} \mathrm {C} & \mathrm {C H} _ {2} - \mathrm {C H} _ {3} \end{array}$$

According to the IUPAC nomenclature system, this compound is called 2-bromo-4-chloro-4-ethyl-3-methylhexane.