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QJEEM08Ch6921: JEE Main 2008 Chemistry - Class 11 JEEM08Ch6921 Solution: The electrophile, E ⊕ attacks the benzene ring to generate the…

The electrophile, E⊕ attacks the benzene ring to generate the intermediate σ−complex. Of the following, which σ−complex is lowest energy?

Multiple Choice Options

  • A https://ik.imagekit.io/novatra/photos/89ad3401d152559414cdeb0f2bf773c5df010ee5fe7bab80d691fe58db1724f9.webp
  • B https://ik.imagekit.io/novatra/photos/315e0795a0a144f91a9ebd329b8fd1b754464308ca9b43352cc1c2f46dbe193d.webp
  • C https://ik.imagekit.io/novatra/photos/f3d4321ce39769bcbf93fa4850f96becb4d79dc3ff1224bca05a728e02f59287.webp
  • D https://ik.imagekit.io/novatra/photos/1527290e846b4580a4281fb6f12ae057e7e850bf2b28bf7ca84b4fc74e7d65b6.webp

Step-by-Step Verified Solution

In option (b) the complex formed is with benzene where as in other cases it is formed with nitrobenzene with −NO2 group in different position (O−,m−,p−). The complex formed with nitrobenzene in any position of −NO2 group is less stable than the complex formed with benzene so the correct answer is (b)

NOTE : The most stable complex has lowest energy.

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