Question

Which of the following undergoes two steps of reactions to become saturated?

Options

• \[\begin{array}{cc}
  |\phantom{......}|\\
  \ce{- C - C -}\\
  |\phantom{......}|\\
  \end{array}\]

• \[\begin{array}{cc}
  |\phantom{......}|\\
  \ce{- C ≡ C -}\\
  |\phantom{......}|\\
  \end{array}\]

• \[\begin{array}{cc}
  |\phantom{......}|\\
  \ce{C = C}\\
  |\phantom{......}|\\
  \end{array}\]

• − C ≡ C −

Answer 1

− C ≡ C −

Explanation:

The compound contains a triple bond (C ≡ C). It requires two steps of hydrogen addition to become saturated:

\[\ce{C # C -> C = C -> C - C}\]