In NMR spectroscopy, the chemical shift (δ) of an alkynyl proton is higher than that of an alkenyl proton. Here's why:

* Deshielding: The chemical shift is influenced by the electron density around the proton.

* Hybridization: Sp hybridized carbon atoms in alkynes are more electronegative than sp2 hybridized carbon atoms in alkenes.

* Electron Density: This higher electronegativity in alkynes leads to a lower electron density around the alkynyl proton.

* Shift: A lower electron density results in a downfield shift (higher δ value) in NMR.

In summary:

* Alkynyl protons (sp hybridized): Higher chemical shift (δ) due to lower electron density.

* Alkenyl protons (sp2 hybridized): Lower chemical shift (δ) due to higher electron density.

Therefore, the chemical shift of an alkynyl proton will typically be found further downfield (at a higher δ value) than an alkenyl proton in an NMR spectrum.