# Which of the following dyes get attached to the fibre loy an irreversible chemical reaction?

$(a)\;\text{Vat dyes} \\ (b)\;\text{Fibre reactive dyes} \\(c)\;\text{Mordant dyes} \\ (d)\;\text{Direct dyes}$

Fibre reactive dye get attached to the fibre ley an irreversible chemical reaction.
Actually , there is a substitution of certain groups present in the dyes of hydnoxyl or amino group indifferent fibres like cotton, wool, silk etc.
Hence b is the correct answers.