Name of Alkane [Pic Included]

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Homework Statement



2lswshs.jpg

Enter the name for the above alkane.

Homework Equations



How to count Carbons and Hydrogen's.

The Attempt at a Solution



My answer was "Undecane" because I counted 11 Carbons and 24 Hydrogens but it says im wrong. Any Idea?
 
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Answers and Replies

  • #2
symbolipoint
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FIND THE LONGEST STRAIGHT CHAIN OF CARBONS. After that,... adjust the name according to the branches.

Big hint: 11 is NOT the number of carbons in the longest chain.
 
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so the longest chain has 8 carbon atoms, with an ethyl group coming off the 3rd atom, and a methyl group coming off the 5th atom. SO...

3-ethyl 5-methyl octane ?
 
  • #4
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so the longest chain has 8 carbon atoms, with an ethyl group coming off the 3rd atom, and a methyl group coming off the 5th atom. SO...

3-ethyl 5-methyl octane ?

Good for the identification details. I'm no longer sure about the punctuation; maybe someone else will say. (Maybe a quick review in wikipedia?)
 
  • #5
symbolipoint
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OK, I know you nearly had it perfectly.

3-ethyl-5-methyloctane
 
  • #6
OK, I know you nearly had it perfectly.

3-ethyl-5-methyloctane

hi...i just get a bit confused on when to use the brackets and commas in a name or not...
 
  • #7
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Good for the identification details. I'm no longer sure about the punctuation; maybe someone else will say. (Maybe a quick review in wikipedia?)

thanks you . .
 

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