Chapter 22, Problem 77A

Interpretation Introduction

Interpretation: To molecular formula of the compound is ${\text{C}}_{\text{4}}{\text{H}}_{\text{6}}$ and to determine which form of this molecular formula is less stable.

Concept Introduction: Structural formulas are used to give the structures for the compounds. It helps in telling the exact number of atoms that are present in a compound along with functional groups if present.

Answer to Problem 77A

Butyne is the least stable.

Explanation of Solution

The compound with molecular formula ${\text{C}}_{\text{4}}{\text{H}}_{\text{6}}$ can be an alkyne, cycloalkene, or an alkene having two double bonds.

The structural formula of the compound when ${\text{C}}_{\text{4}}{\text{H}}_{\text{6}}$

behaves as an alkyne is represented as follows:

  

The above compound is known as buytne.

The structural formula of the compound when ${\text{C}}_{\text{4}}{\text{H}}_{\text{6}}$

behaves as an alkene having two double bonds is represented as follows:

  

The structural formula of the compound when ${\text{C}}_{\text{4}}{\text{H}}_{\text{6}}$

behaves as cycloalkene is represented as follows:

  

The above compound is known as cyclobutene.

Out of these compounds, butyne is the least stable.

Conclusion

Alkynes are least stable than other hydrocarbons. Therefore, Butyne is the less stable out of the three compounds.