In which of the following process, no change in hybridisation state occur but bond angle increases

Options

A. ` BF _ 3 + bar F to B F _ 4 ^ - `
B. ` H _ 2O + H^+ to H _ 3 O ^+ `
C. `BeF _ 2 + 2 bar F to BeF _ 4 ^ ( - 2 ) `
D. ` BeCl _ 2 ( g ) to BeCl _ 2 (s ) `

Answer

B