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Standard XII

Chemistry

Nucleophilic Substitution in Aryl Halides

Which of the ...

Question

Which of the following is most reactive towards nucleophilic substitution?

Chlorobenzene

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2, 4, 6

- Trinitrochlorobenzene

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2, 4

- Dinitrochlorobenzene

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2

- Nitrochlorobenzene

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Solution

The correct option is B $2, 4, 6$ - Trinitrochlorobenzene

Compounds with more number of $N O_{2}$ ( at ortho and para) will perform the fastest nucleophilic substitution reaction.

Hence $2, 4, 6$ - trinitrochloro benzene is most reactive.

The order for reactivity is as shown in figure.

Option B is correct.

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Similar questions

Q. Rank the following compounds in order of decreasing reactivity toward electrophilic substitution (most reactive first).

(I)

Chlorobenzene

(I I)

4-nitrochlorobenzene

(I I I)

2,4-dinitrochlorobenzene

(I V)

2,4,6-trinitrochlorobenzene

Q. Rank the following compounds in order of decreasing electron density in the benzene
(I) Chlorobenzene (II)

4

- nitrochlorobenzene
(III)

2, 4

- dinitrochlorobenzene (IV)

2, 4, 6

- trinitrochlorobenzene

(I) C h l o r o b e n z e n e

(I I) 2, 4 - d i n i t r o c h l o r o b e n z e n e

(I I I) p - n i t r o c h l o r o b e n z e n e

The decreasing order of their reactivities towards electrophilic substitution reaction is:

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

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Which of the following is most reactive towards nucleophilic substitution?

The correct option is B 2,4,6 - TrinitrochlorobenzeneCompounds with more number of NO2 ( at ortho and para) will perform the fastest nucleophilic substitution reaction.Hence 2,4,6 - trinitrochloro benzene is most reactive.The order for reactivity is as shown in figure.Option B is correct.