The decreasing order of the basic character of the following is :
(I) `F^(Ө)`
(II) `NO_3^(Ө)`
(III) `H_2 O`
(IV) `CH_3 OH`.

Options

A. `(II) gt (I) gt (IV) gt (III)`
B. `(III) gt (IV) gt (I) gt (II)`
C. `(I) gt (II) gt (III) gt (IV)`
D. `(IV) gt (III) gt (II) gt (I)`

Answer

C

Explanation

Acidity : `CH_3 .^+OH_2 gt H_3O^+ gt HNO_3 gt HF`
`pK_a : - 2.5 -1.74 -1.4 3.2`
(See to Table 4.3)
Basicity : `CH_3OH lt OH_2 O lt NO_3^(Ө) lt F^(Ө)`
`[(I) gt (II) gt (III) gt (IV)]`.