Step 1: Understand what a -I effect is. The -I effect (negative inductive effect) refers to the ability of a group to withdraw electron density from the rest of the molecule.
Step 2: Identify the group in the question. In this case, we are looking at the group 'F' (Fluorine).
Step 3: Analyze the properties of Fluorine. Fluorine is highly electronegative, meaning it attracts electrons strongly.
Step 4: Conclude that since Fluorine attracts electrons, it has a -I effect, which means it withdraws electron density from the rest of the molecule.
