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Chapter 26: Problem 101

The compound isoheptane is best represented by the formula (a) \(\mathrm{C}_{7} \mathrm{H}_{14} ;\) (b) \(\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{5} \mathrm{CH}_{3}\) (c) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}\left(\mathrm{CH}_{2}\right)_{3} \mathrm{CH}_{3} ;(\mathrm{d}) \mathrm{C}_{6} \mathrm{H}_{11} \mathrm{CH}_{3}\).

Short Answer

Expert verified
The compound isoheptane is best represented by the formula (c) \((CH_{3})_{2}CH(CH_{2})_{3}CH_{3}\)

Step by step solution

01

Identify the Right Amount of Carbon and Hydrogen Atoms

In this step, examine each formula and check the number of Carbon and Hydrogen atoms. Isoheptane has 7 Carbon atoms and 16 Hydrogen atoms.
02

Match the Formula with Right Amount of Carbon and Hydrogen Atoms

On comparing the atoms count with the options: (a) \(C_{7}H_{14}\) has 7 Carbon and 14 Hydrogen atoms, (b) \(CH_{3}(CH_{2})_{5}CH_{3}\) has 7 Carbon and 16 Hydrogen atoms, (c) \((CH_{3})_{2}CH(CH_{2})_{3}CH_{3}\) also has 7 Carbon and 16 Hydrogen atoms, and (d) \(C_{6}H_{11}CH_{3}\) has 7 Carbon and 14 Hydrogen atoms. Out of these, options (b) and (c) matches with the atom count of Isoheptane.
03

Match the Iso- Prefix in the Compound’s Name

The prefix iso- in organic chemistry implies that the molecule contains a secondary Carbon atom, which is a Carbon atom connected to two other Carbon atoms. Looking at options (b) and (c), only (c) \((CH_{3})_{2}CH(CH_{2})_{3}CH_{3}\) has a secondary Carbon atom. So, the best representative for isoheptane is (c).

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Most popular questions from this chapter

Supply condensed structural formulas for the following substances. (a) \(o\) -tert-butylphenol (an antioxidant in aviation gasoline) (b) 1 -phenyl- 2 -aminopropane (benzedrine-an amphetamine, ingredient in "pep pills") (c) 2 -methylheptadecane (a sex pheromone of tiger moths-a chemical used for communication among members of the species) [ Hint: Heptadeca means 17.].

Draw the \(E\) and \(Z\) isomers of (a) 3 -methyl- 3 -hexene; \((b)\) 3-fluoro-2-methyl-3-hexene.

Classify the carbon atoms in (a) 2,4 -dimethylpentane, and (b) ethylcyclobutane as methyl, primary \(\left(1^{\circ}\right)\) secondary \(\left(2^{\circ}\right),\) tertiary \(\left(3^{\circ}\right),\) or quaternary \(\left(4^{\circ}\right)\).

Draw a condensed structure to correspond to each of the following names. (a) methylbutane; (b) cyclohexene; (c) 2 -methyl- 3 -hexyne; (d) 2 -butanol; (e) ethyl isopropyl ether; (f) propanal

Write structural formulas corresponding to these condensed formulas. (a) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCH}_{2} \mathrm{CH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}\) (b) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCH}_{2} \mathrm{C}\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}_{2} \mathrm{Br}\) (c) \(\mathrm{Cl}_{3} \mathrm{CCH}_{2} \mathrm{CH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{Cl}\).
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