Why Is the Correct Name 3-Methyl-3-Propylheptane?

[toothpaste666]

Homework Statement

The Attempt at a Solution

The answer is supposedly C but I can't figure out why its not E.
first I count the number of C in the longest chain. There are 7 C and there are only single bonds so the the root and suffix is heptane. there is a chain with one C (methyl) and one with 3 C (propyl) and they are both attached the the third carbon counting from the side that gives the smallest numbers. listing in alphabetical order the name should be 3-methyl-3-propylheptane

 

[Borek]

You have to select the longest chain. Which number is higher 7, or 8?

 

[toothpaste666]

I am confused. To me it seems that there are 3 chains, one with 7, one with 3 and one with 1 carbons

 

[Borek]

E can't be right as it calls for HEPTane, when there is a possible OCTane chain.

 

[toothpaste666]

forgive me if it is obvious but I don't see where the octane chain could be

 

[Bystander]

"Longest chain" doesn't necessarily mean longest straight line.

 

[Borek]

Start from the leftmost carbon, turn right (down) at the ternary carbon.

 

[toothpaste666]

ahh i get it now. thanks guys