Question

What type of overlap is involved in the formation of C $-$ H bonds in acetylene molecules?

• A. sp$^{3}$ $-$ s
• B. sp$^{2}$ $-$ s
• C. sp $-$ s
• D. sp $-$ sp

Hint:

Alkanes ($C-H$) $\rightarrow sp^3-s$; Alkenes ($C-H$) $\rightarrow sp^2-s$; Alkynes ($C-H$) $\rightarrow sp-s$.

Answer 1

The Correct Option is C

Step 1: Structure
Acetylene is $H-C \equiv C-H$.
Step 2: Hybridization
In alkynes (triple bonds), each carbon atom is $sp$ hybridized to form a linear geometry.
Step 3: Orbital Overlap
The $C-H$ bond is formed by the overlap of the $sp$ hybrid orbital of Carbon and the $1s$ orbital of Hydrogen.
Step 4: Conclusion
The overlap is $sp-s$.
Final Answer:(C)