Question

The $s$-block element used as a catalyst in the manufacture of Buna-$S$ rubber is

• A. $Mg$
• B. $Ca$
• C. $Ba$
• D. $Na$

Answer 1

Answer: (D)

$Na$

Answer 2

Butadiene (75%) and styrene (25%) polymerise in the presence of sodium to give Buna-S-rubber.