SELECT * FROM question_mgmt as q WHERE id=1343 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=45 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

What is the total number of sigma and pi bonds in the following molecules?

(a) C2H2 (b) C2H4

Answer:

 

Sigma (σ) bond is the bond formed when the two half -filled atomic orbitals overlap along their inter-nuclear axes. Sigma bond will always represent a single bond.

Pie (π) bond is formed when the two half- filled atomic orbitals belonging to the bonding atoms overlap along sides (sidewise or lateral overlap).

A double bond will always have one sigma bond and one pie bond.

A triple bond will always have one sigma bond and two pie bond. So from the structure of C2H2, it is clear that it has three sigma bonds and two pie bonds.

From the structure of C2H4,it is clear that it has five sigma bonds & one pie bond.

 


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