Chemistry · Isomerism: structural and stereoisomerism

How many structural isomers of that have a six membered ring and trisubstituted?

How many structural isomers of \( \boldsymbol{C}_{\mathbf{9}} \boldsymbol{H}_{\mathbf{1} \mathbf{8}} \) that have a six membered ring and trisubstituted?

  • A. 3
  • B. 4
  • C. 5 \)
  • D. 6

Step-by-step solution

The only way to have a six-membered ring and three substituents with C9H18 is to have three methyl groups on a cyclohexane ring (trimethylcyclohexane). The distinct constitutional isomers (ignoring stereochemistry) are 1,2,3; 1,2,4; 1,3,5; 1,1,2; 1,1,3; and 1,1,4-trimethylcyclohexane, totaling 6.
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