JEE Main 2015 · 11 Apr · Shift 1 · Chemistry Q56

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ChemistrySingle correct+4 / -1Question 56 of 90

Which compound exhibits maximum dipole moment among the following ?

Nitrobenzene

p-Nitroaniline

Benzene ring with NO₂ and, para to it, NH₂.

m-Nitroaniline

Benzene ring with NO₂ and, meta to it, NH₂.

o-Nitroaniline

Benzene ring with NO₂ and, ortho to it, NH₂.

Answer and worked solution

Official answer: B

In p-nitroaniline the electron-donating $\ce{NH2}$ and electron-withdrawing $\ce{NO2}$ push charge the same way across the ring and their moments add along one axis. This gives the largest dipole.

Topics:Bond parameters and dipole moment Electronic effects (inductive, resonance, hyperconjugation)

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JEE Main 2015 · 11 Apr · Shift 1, Chemistry question 56