Question

question 5 (1 point)
what is the shape of an alkyne molecule?
bent
linear
tetrahedral
trigonal planar
cyclic

Explanation:

Alkynes have a triple bond \(C\equiv C\). The carbon atoms involved in the triple bond are \(sp\) hybridized. In \(sp\) hybridization, the two \(sp\) hybrid orbitals are oriented at \(180^{\circ}\) to each other. This leads to a linear arrangement of atoms around the triple - bonded carbon atoms. For example, in acetylene (\(HC\equiv CH\)), the \(H - C - C - H\) atoms are in a straight line.

• Bent shape is usually for molecules with \(sp^{2}\) or \(sp^{3}\) hybridization and lone pairs (e.g., \(H_{2}O\) with \(sp^{3}\) hybridization of \(O\) and two lone pairs).
• Tetrahedral shape is for \(sp^{3}\) hybridized atoms with four bonding pairs (e.g., \(CH_{4}\)).
• Trigonal planar is for \(sp^{2}\) hybridized atoms with three bonding pairs (e.g., \(BF_{3}\)).
• Cyclic refers to ring - shaped structures, which is not the general shape for the core triple - bonded part of an alkyne.

Answer:

linear