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What si the correct order of decreasing ...

What si the correct order of decreasing stability of the following carbocations.
`underset(I.)(CH_(3)-overset(o+)(C)H-CH_(3))" "underset(II.)(CH_(3)-overset(o+)(C)H-OCH_(3))`
`underset(III.)(CH_(3)-overset(o+)(C)H-CH_(2)-OCH_(3))`

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(i) HCl (aq) - Acid (Arrhenius conecpt and Bronsted - Lowry concept)
(ii) `NH_(3)(g) `-Base (Bronsted concept and Lewis concept)
(iii) `Na_(2)CO_(3)(aq)`- Base (Bronsted concept)
(iv) `CH_(3)CO OH(aq)`-Acid (Arrhenius concept and Bronsted concept)
(v) `CO_(2)(g)`-Acid (Bronsted concept and Lewis concept)
(vi) `BF_(3)`-Acid (Lewis concept)
(vii) `Ag^(+)`- Acid (Lewis concept)
(viii) `CN^(-)`- Base (Lewis concept)
(ix) `H_(2)O`- Both acid and base, i.e., amphoteric (Bronsted concept)
(x) `H_(2)SO_(4)`- Both acid and base, i.e., amphoteric (Bronsted concept)
(xi) `CHO_(3)^(-)`- Both acid and base, i.e., amphoteric (Bronsted concept)
(xii) `SiF_(4) ` - Acid (Lewis concept), as silicon can expand its octet .
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