Which C–H bond is the longest?

Consider the molecule ethene ($C_2{H}_4$). How many sigma and pi bonds are present in this molecule?

Which of the following correctly describes a single bond compared to a double bond in terms of $\sigma$ and $\pi$ bonds?

In order for a $\pi$ bond to form, there must be:

Rank the following bonds from shortest to longest

Which of the bonds in a carbon–oxygen double bond has more effective orbital–orbital overlap: the σ bond or the π bond?

a. Which bond would be longer?

b. Which bond would be stronger?

1. C—Cl or C—I

a. Which bond would be longer?

b. Which bond would be stronger?

2. C—C or C—Cl

a. Which bond would be longer?

b. Which bond would be stronger?

3. H—Cl or H—F