Multiple theoretical and experimental investigations have been conducted to study various features of pure and passivated the h-BN monolayer, what is lacking here is a meticulous study on the structural, mechanical, and optoelectronic response of fluorinated h-BN. Intrigued by the prior findings, the first-principles calculations are performed with the density functional theory to investigate and unravel the underlined properties of fluorinated hexagonal boron nitride monolayer.