23. Which of the following statements is true?
(A) a triple bond is composed of two a bonds and one x bond.
(B)σ bonds result from the head-to-head overlap of atomic orbitals.
(C) Free rotation may occur about a double bond.
(D) x bonds have electron density on the internuclear axis.
(E) the Lewis structure for C2H2 shows single bonds and one double bond.