Arrange the following bonds in order of increasing ionic character,giving reasons: $N-H$,$F-H$,$C-H$,and $O-H$.

(N/A) The ionic character of a bond is directly proportional to the electronegativity difference between the two bonded atoms. The greater the difference,the more polar (ionic) the bond is.

Bond	Electronegativity difference
$C-H$	$2.5 - 2.1 = 0.4$
$N-H$	$3.0 - 2.1 = 0.9$
$O-H$	$3.5 - 2.1 = 1.4$
$F-H$	$4.0 - 2.1 = 1.9$

Based on the electronegativity values,the increasing order of ionic character is:
$C-H < N-H < O-H < F-H$