Number of σ and π bonds present in ethylene molecule is respectively :

Solution

Chemistry ma’am · 4 steps

Draw ethylene fully, count every single bond as one sigma, then add the extra bond inside the double bond.

1. Draw the structure. Ethylene is H₂C=CH₂. Each carbon holds two hydrogens, and the two carbons are joined by a double bond.
2. Count sigma bonds. Every bond between two atoms has exactly one σ bond. There are four C-H bonds and one C-C link, so 4 + 1 = 5 σ bonds.
3. Count pi bonds. A double bond is one σ plus one π. Ethylene has only the one C=C double bond, so it has 1 π bond.
4. So. Ethylene has 5 σ bonds and 1 π bond, which is option (b).

The idea to keep. Every bond between two atoms gives one σ. A double bond adds one π, a triple bond adds two. Count the bonds first, then the extras.

Answer from the NTA final answer key. Solution by PrepWiser.