Select all the statements that correctly describe the influence of structural features on chemical shift of protons. Multiple select question. The chemical shift of an H will increase with increasing alkyl substitution of its attached C atom. H atoms attached to double bonds or aromatic rings are especially deshielded. Two electronegative atoms will compete and their deshielding effects will cancel, causing a nearby proton to be more shielded. H atoms attached to triple bonds have very high chemical shift values. Any electronegative atom will deshield nearby protons, resulting in a higher chemical shift.