Question

Which of the following substances undergo(s) disproportionation reactions under basic medium?

• A. $F_2$
• B. $P_4$
• C. $S_8$
• D. ${Br}_2$

Answer 1

Answer: (B), (C), (D)

The correct options are
B $P_4$
C $S_8$
D ${Br}_2$

Disproportionation is a specific type of redox reaction in which a species is simultaneously reduced and oxidised to form two different products.
b. $3H_{2}O+\stackrel{0}{P_4}+3\stackrel{\ominus }{O}H⟶\stackrel{-3}{{PH}_3}+3H_2\stackrel{+1}{P}{O}_2^{\ominus }$
c. $S_8^0+12\stackrel{\ominus }{O}H⟶4S^{2-}+2\stackrel{+2}{S_2}{O}_3^{2-}+6H_{2}O$
d. $\stackrel{0}{{Br}_2}+2\stackrel{\ominus }{O}H⟶\stackrel{+1}{Br}{O}^{\ominus }+\stackrel{-1}{{Br}^{\ominus }}+H_{2}O$
So, all these three are disproportionation reactions under basic medium.