Identify the Planar molecule from the image given below

Dear Student,
                      In this question you should take care of the planarity with respect to the structure.

If you consider (I), this structure of benzene is planar and aromatic compound .

If you consider(II), this structure is non planar. This structure is allene and the -CH3 groups present are in other planes. So it is non planar.

In (III), the structure is tub-shaped, non planar . Hence it is non aromatic. 

Hence the only correct answer is (I) benzene.

I hope you understood . Keep posting.

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