Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH the correct order of increasing ionic character is

Options

A. `LiH lt NaH lt CsH lt KH lt RbH`
B. `LiH lt NaH lt KH lt RbH lt CsH`
C. `RbH lt CaH lt NaH lt KH lt LiH`
D. `NaH lt CsH lt RbH lt LiH lt KH`

Answer

B

Explanation

Ionic character increases as electronegativity difference between the element and hydrogen increases