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Chemistry Question on p -Block Elements

Which is the correct thermal stability order for H2EH_2E (E = O. S. Se. Te and PoPo) ?

A

H2Po<H2Te<H2Se<H2S<H2OH_2Po < H_2Te< H_2Se < H_2S < H_2O

B

H2Se<H2Te<H2Po<H2O<H2SH_2Se < H_2Te< H_2Po < H_2O < H_2S

C

H2S<H2O<H2Se<H2Te<H2PoH_2S < H_2O < H_2Se < H_2Te< H_2 Po

D

H2O<H2S<H2Se<H2Te<H2PoH_2O < H_2S < H_2Se < H_2Te < H_2Po

Answer

H2Po<H2Te<H2Se<H2S<H2OH_2Po < H_2Te< H_2Se < H_2S < H_2O

Explanation

Solution

On going down the group thermal stability order for H2EH_2 E decreases because H-E bond energy decreases
∴\therefore Order of stability would be:-
H2Po<H2Te<H2Se<H2S<H2O{H_2 Po < H_2 Te < H_2 Se < H_2S < H_2 O}