Question

THPC flame retardant is produced by reaction of

• A. Phosphine and Formaldehyde
• B. Urea and Formaldehyde
• C. Sulphur and Formaldehyde
• D. Ammonia and Formaldehyde

Hint:

THPC (Tetrakis(hydroxymethyl)phosphonium chloride) is made from phosphine, formaldehyde, and hydrochloric acid. The key is the phosphine for phosphorus content.

Answer 1

The Correct Option is A

Step 1: Understanding THPC: THPC stands for Tetrakis(hydroxymethyl)phosphonium chloride. It's a phosphorus-containing compound used as a flame retardant, particularly for cotton fabrics. 
Step 2: THPC Synthesis: Tetrakis(hydroxymethyl)phosphonium chloride (THPC) is synthesized by reacting phosphine gas PH3 with formaldehyde HCHO and hydrochloric acid HCl. This reaction results in the formation of a phosphonium salt.