The decreasing order of reactivity of following compound towards $O H^{-}$ ions is:
(I) 3-nitrobromobenzene
(II) 2, 4, 6-trinitrobromobenzene
(III) 4-nitrobromobenzene
(IV) 2, 4-dinitrobromobenzene

I > II > III > IV

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II > IV > III > I

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IV > II > III > I

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II > IV > I > III

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Solution

The correct option is B II > IV > III > I
Greater the number of $- N O_{2},$ groups at ortho and para positions to $- B r$ group, greater is the reactivity of the compound towards $O H^{-}$ ions due to stabilization of intermediate carbanion. (II) having three $- N O_{2}$ groups is most reactive while (I) having $- N O_{2}$ group at meta position is least reactive.
Hence the reactivity order is II > IV > III > I

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Q. The decreasing order of reactivity of meta-nitrobromobenzene (I),

2, 4, 6

-trinitrobromobenzene (II), para-nitrobromobenzene (III), and

2, 4

-dinitrobromobenzene (IV) Towards

H O^{-}

ions is:

Q. (I) m-nitrobromobenzene (II) 2,4,6-trinitrobromobenzene
(III) p-nitrobromobenzene (IV) 2,4-dinitrobromobenzene
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Q. Rank the following compounds in order of decreasing reactivity towards electrophilic substitude reaction
I) Chlorobenzene II) 4-Nitrochlorobenzene
III) 2,4-dinitrochlorobenzene IV) 2, 4, 6-trinitrochlorobenzene

Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, $E^{+}$
(a)Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene

(b)Toluene, $p - H_{3} C - C_{6} H_{4} - N O_{2}, p - O_{2} N - C_{6} H_{4} - N O_{2} .$

Q. Arrange the following compound in decreasing order of reactivity towards addition reaction.
(I)

C_{6} H_{3} C O C H_{3}

(II)

C H_{3} C O C_{2} H_{5}

(III)

C_{6} H_{3} C H O

(IV)

C H C H_{2} C H O

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The decreasing order of reactivity of following compound towards OH−ions is: (I) 3-nitrobromobenzene (II) 2, 4, 6-trinitrobromobenzene (III) 4-nitrobromobenzene (IV) 2, 4-dinitrobromobenzene

The decreasing order of reactivity of following compound towards $O H^{-}$ ions is:
(I) 3-nitrobromobenzene
(II) 2, 4, 6-trinitrobromobenzene
(III) 4-nitrobromobenzene
(IV) 2, 4-dinitrobromobenzene