Of the nine structural isomers of heptane, C7H16, how many contain a quaternary carbon (a carbon bonded to four other carbon atoms)?

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Of the nine structural isomers of heptane, $C X_{7} H X_{16}$ , how many contain a quaternary carbon (a carbon bonded to four other carbon atoms)?

Answer: A

Place a carbon with four C neighbours: 2,2-dimethylpentane, 3,3-dimethylpentane and 2,2,3-trimethylbutane. 2,2-Dimethylpentane has one quaternary C, as do the other two; none of the nine has two. Total 3.

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Of the nine structural isomers of heptane, CX7​HX16​, how many contain a quaternary carbon (a carbon bonded to four other carbon atoms)?

Answer: A

More questions on Counting structural isomers

Of the nine structural isomers of heptane, $C X_{7} H X_{16}$ , how many contain a quaternary carbon (a carbon bonded to four other carbon atoms)?