Question

question 5 (1 point)
looking at the c - c bonds in each of the structures, what trend exists as you move from left to right?
a) bond length increases; bond strength increases
b) bond length increases; bond strength decreases
c) bond length decreases; bond strength decreases
d) bond length decreases; bond strength increases

Explanation:

• For carbon - carbon bonds:
• The left - most structure has a \(C - C\) single bond (\(C - C\)), the middle one has a \(C = C\) double bond, and the right - most one has a \(C\equiv C\) triple bond.
• As the number of bonds between two carbon atoms increases (from single to double to triple), the bond length decreases. This is because more electron density is shared between the two carbon atoms, pulling the nuclei closer together.
• As the number of bonds increases (from single to double to triple), the bond strength increases. A triple bond has more energy required to break it compared to a double bond, and a double bond has more energy required to break it compared to a single bond.

Answer:

D. Bond length decreases; Bond strength increases