Q2 / 150 · MHT CET 2026 (17 April Shift 2) · Chemistry
Which from following is a first stage in preparation of viscose rayon ?
- Correct answerA$\text{Cell} - \text{OH} + \text{NaOH}$
- B
- C
- D
Solution
The preparation of viscose rayon involves several steps.
In the first stage, cellulose is treated with a concentrated solution of sodium hydroxide ($\text{NaOH}$) to form alkali cellulose. The reaction is:
$\text{Cell}-\text{OH} + \text{NaOH} \rightarrow \text{Cell}-\text{ONa} + \text{H}_2\text{O}$
In the subsequent stages, the alkali cellulose is reacted with carbon disulfide ($\text{CS}_2$) to form sodium cellulose xanthate, which is then dissolved in dilute $\text{NaOH}$ to form a viscous solution called viscose. Finally, it is extruded into an acid bath to regenerate cellulose fibers.
Therefore, the first stage is the reaction of cellulose with $\text{NaOH}$.
Answer: $\text{Cell} - \text{OH} + \text{NaOH}$
In the first stage, cellulose is treated with a concentrated solution of sodium hydroxide ($\text{NaOH}$) to form alkali cellulose. The reaction is:
$\text{Cell}-\text{OH} + \text{NaOH} \rightarrow \text{Cell}-\text{ONa} + \text{H}_2\text{O}$
In the subsequent stages, the alkali cellulose is reacted with carbon disulfide ($\text{CS}_2$) to form sodium cellulose xanthate, which is then dissolved in dilute $\text{NaOH}$ to form a viscous solution called viscose. Finally, it is extruded into an acid bath to regenerate cellulose fibers.
Therefore, the first stage is the reaction of cellulose with $\text{NaOH}$.
Answer: $\text{Cell} - \text{OH} + \text{NaOH}$
Hence, the correct answer is option: 'A'.