Question

IV). A. Write chemical equations for the synthesis of Orange I from sulfanilie acid. IV. B. Define chromophores and auxochromes. Give two examples of each. IV. C. What are the different methods available to dye cloth? Define each method to dye cloth. 7 7

Answer 1

Date Dogs Solution. IVA. Step 1: NHA NHL + Na₂CO₃ → Soz Na soj Sulfanilic acid depriotonated sulfanilicaud + H2O + CO2 Step? THE NEN: * NANO + 2HU Na so Naso diazo diazotied ulfanilic and + 2H₂O + Nach :04 Shep 3: NEN: + + NaOH 1 Nat sog ROH NEN + H20 + Nall (OTEITE |) INCH Chromophores are isolated covalently Landed quoup that showi a characteristic al souption in the UV i visible region. Mase example i - C = C.- Aurochrome are any quoup which does not itself act an a chuomaphore but where presence

beings about a shift of the absorption band towaudi thened end of the spectrum . fall example 8 -01,-COOH ete. 1. Bale dyeing IV.C. some of the methods to dye cloth are: The material is sent without ecoming or singeing through acold water bath where the sized waup has affinity for the dye. Batik dyeing - poutions of the fabricare coated with wat so that only unwaxed areas will take on the dye mates • Beam dyeing - The worp is dyed buios to weaving and it wound onto a perforated beam & the dye is fouled through the perforation, thereby sattating the yarn with colow 4. Chain dyeing - several cuts one pieces of cloth are tacked end to end and sun through in a continuous chain in the dye calous S. Pieve dyeing - Dyeing of fabric is the cute 6. Jig dyeing - Faltic goes from one Mollerto another through a deep dye bath until the desired shade is achieved Random dyeing – Colowning anly certain designated portions of youn balt or piece: the