The correct option is B ClH−−−Cl<NH−−−N<OH−−−O<FH−−−F
Strength of H–bond ∝ polarity of H–atom ∝ EN of the atom attach to the H–atom
Higher the electronegativity of the element, higher will be the bond polarity of hydrogen.
Electronegative element withdraws the electron toward itself and create charge separation (polarity)
Electronegative order of the elements in given molecule is
F > O > N > Cl.
Thus strength of hydrogen bond is in the order,
Hence, the correct answer is option (b).