Which one of the following is not a straight-chain hydrocarbon.

${C H}_{3} - {C H}_{2} - {C H}_{2} - {C H}_{2} - {C H}_{2} - {C H}_{3}$

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${C H}_{3} - {C H}_{2} - {C H}_{2} - {C H}_{2} - {C H}_{2} - {C H}_{2} - {C H}_{3}$

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${({C H}_{3})}_{2} C H - {C H}_{2} - {C H}_{2} - {C H}_{2} - {C H}_{3}$

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${C H}_{3} - {C H}_{2} - {C H}_{2} - {C H}_{2} - {C H}_{3}$

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Solution

The correct option is C
${({CH}_{3})}_{2} CH - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{3}$

Step 1:
The organic compounds consisting of Carbon $(C)$ and Hydrogen $(H)$ atoms are known as hydrocarbons.
The hydrocarbons in which carbon atoms are linked in a straight chain and no branching or substituents are present in the long chain is called straight-chain hydrocarbons.
Step 2:
The explanation for the correct option:
In the given compound $({({CH}_{3})}_{2} CH - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{3})$ two methyl groups are present on the same Carbon atom.
So it is not a straight-chain hydrocarbon.
The explanation for the incorrect option:
In the compound Hexane $({CH}_{3} - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{3})$ the Carbon atoms are attached in a linear straight chain.
In the compound Heptane $({CH}_{3} - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{3})$ the Carbon atoms are attached in a linear straight chain.
In the compound Pentane $({CH}_{3} - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{3})$ the Carbon atoms are attached in a linear straight chain.
Final answer:
Hence, option (D) is the correct option.

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Write the IUPAC names of the following straight chain saturated hydrocarbons (or alkanes).
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