Question

Which of the following is not a straight chain hydrocarbon?

Options

• \[\begin{array}{cc}
  \ce{H3C - CH2 - CH2 - CH2 - CH2}\\
  \phantom{.........................}|\\
  \phantom{............................}\ce{CH3}
  \end{array}\]

• \[\ce{H3C - CH2 - CH3 - CH2 - CH3}\]

• \[\begin{array}{cc}
  \ce{CH3}\phantom{................}\\
  |\phantom{..................}\\
  \ce{H2C - H2C - H2C - CH2}\\
  \phantom{...................}|\\
  \phantom{.....................}\ce{CH3}
  \end{array}\]

• \[\begin{array}{cc}
  \ce{CH3}\phantom{.............................}\\
  \backslash\phantom{.........................}\\
  \ce{CH - CH2 - CH2 - CH3}\\
  /\phantom{.........................}\\
  \ce{H3C}\phantom{.............................}\\
  \end{array}\]

Answer 1

Explanation - 

In the hydrocarbon (d), branching takes place at carbon-2.