Final answer:
The C-H stretch for an sp hybridized carbon occurs near 3300 cm-1 in the IR spectrum, showing a higher wavenumber due to the carbon's higher electronegativity and the increased s-character, resulting in a stronger bond.
Step-by-step explanation:
The C-H stretch in an sp hybridized carbon can be observed in the infrared (IR) spectroscopy range. Typically, the C-H stretching vibrations for an sp hybridized carbon, such as in acetylene (HC=C-H), occur at higher wavenumbers compared to those of sp² or sp³ hybridized carbons. This is due to the higher electronegativity of the sp hybridized carbon, which increases the s-character of the bond, leading to a stronger and thus higher frequency for the stretching vibration. In acetylene, for example, the C-H stretch occurs near 3300 cm⁻¹. It is also worth noting that in such a linear molecule, characterized by sp hybridization, the hydrogen atoms carry a slight positive charge (denoted as S+ in electostatic maps), indicating a polarity in the C-H bond.