Molecular Structure of Acetylene H Copyright2010 Pearson Prentice Hall,Inc. Triple-bonded carbons have sp hybrid orbitals. A sigma bond is formed between the carbons by overlap of the sp orbitals. 。 Sigma bonds to the hydrogens are formed by using the second sp orbital. 。 Since the sp orbitals are linear,acetylene will be a linear molecule. Chapter9 9Chapter 9 9 Molecular Structure of Acetylene • Triple-bonded carbons have sp hybrid orbitals. • A sigma bond is formed between the carbons by overlap of the sp orbitals. • Sigma bonds to the hydrogens are formed by using the second sp orbital. • Since the sp orbitals are linear, acetylene will be a linear molecule