Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, $E^{+}$ .
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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Solution

The decreasing relative reactivity with an electrophile is
$T o l u e n e > p - C H_{3} - C_{6} H_{4} - N O_{2} > p - O_{2} N C_{6} H_{4} N O_{2}$
As the number of electron withdrawing nitro groups on the benzene nucleus increases, the electron density of benzene ring decreases and the reactivity with an electrophile decreases.

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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-H₃C–C₆H₄–NO₂, p-O₂N–C₆H₄–NO₂.

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

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Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E+.Toluene, p−H3CC6H4NO2,p−O2NC6H4NO2.

The decreasing relative reactivity with an electrophile isToluene>p−CH3−C6H4−NO2>p−O2NC6H4NO2 As the number of electron withdrawing nitro groups on the benzene nucleus increases, the electron density of benzene ring decreases and the reactivity with an electrophile decreases.

Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, $E^{+}$ .
Toluene, $p - H_{3} C C_{6} H_{4} N O_{2}, p - O_{2} N C_{6} H_{4} N O_{2}$ .