Which from following is a first stage in preparation of viscose rayon ?

Step-by-step solution

The preparation of viscose rayon involves several steps. In the first stage, cellulose is treated with a concentrated solution of sodium hydroxide ( NaOH ) to form alkali cellulose. The reaction is: Cell - OH + NaOH Cell - ONa + H ₂ O In the subsequent stages, the alkali cellulose is reacted with carbon disulfide ( CS ₂ ) to form sodium cellulose xanthate, which is then dissolved in dilute NaOH to form a viscous solution called viscose. Finally, it is extruded into an acid bath to regenerate cellulose fibers. There