Write the order of thermal stability of the hydrides of Group 16 elements

Options

A. `H_2Po lt H_2Telt H_2Se lt H_2SltH_2O`
B. `H_2Polt H_2O lt H_2Te lt H_2Se lt H_2S`
C. `H_2S lt H_2O lt H_2Te lt H_2Se lt H_2Po`
D. `H_2O lt H_2S lt H_2Telt H_2Se lt H_2Po`

Answer

A

Explanation

Down the group (H-E) bond dissociation enthalpy decreases as (H-E) bond length increase because of increases in size of cation. Thus thermal stability of hybrides also decreases.