Question

question 8
in sigma and pi bonding, multiple bonds consist of both sigma and pi bonds. how many sigma and pi bonds are in double bonds?
(reference p 266 of your textbook.)
a double bonds have two pi bonds, triple bonds have 1 sigma and 2 pi bonds.
b double bonds have 2 pi bonds, triple bonds have 1 sigma and 2 pi bonds.
c double bonds have one sigma and one pi bond, triple bonds have 3 pi bonds.
d double bonds have one sigma and one pi bond.

Explanation:

• A single bond is a sigma ($\sigma$) bond.
• A double bond consists of one sigma ($\sigma$) bond and one pi ($\pi$) bond.
• A triple bond consists of one sigma ($\sigma$) bond and two pi ($\pi$) bonds.

Now let's check each option:

• Option A: Double bonds have two pi bonds - incorrect. Double bonds have one $\sigma$ and one $\pi$ bond.
• Option B: Double bonds have 2 pi bonds - incorrect. Double bonds have one $\sigma$ and one $\pi$ bond.
• Option C: Triple bonds have 3 pi bonds - incorrect. Triple bonds have one $\sigma$ and two $\pi$ bonds.
• Option D: Double bonds have one sigma and one pi bond - correct.

Answer:

D. Double bonds have one sigma and one pi bond.