Correct Answer: Option D

Explanation

The structure comprises a benzene ring ( C\(_6\)H\(_5\) ) with a CH\(_2\)-CH\(_3\) substituent attached to it.

Recall that benzene is aromatic compound, as well as conjugated compound having three double bonds and three single bonds.

If we re-write the molecular formular of the compound,trying to represent on a straight chain just for better understanding, we'll have  -CH=CH-CH=CH-CH=CH-CH\(_2\)-CH\(_3\)

Whenever you are solving questions on Hybridization of Hydrocarbons, always use this key:

If the compound contains a Carbon atom + single bonded to 4 atoms - SP\(^3\)

If the compound contains a Carbon atom + one double bond + two single bonds - SP\(^2\)

If the compound contains a Carbon atom + a triple bond + one single bond - SP

      SP\(^2\)              SP\(^2\)             SP\(^3\)                                         

-CH=CH-CH=CH-CH=CH-CH\(_2\)-CH\(_3\)   

There's no triple bond, hence there will be no SP hybridization but we only have SP\(^3\) an SP\(^2\) because of the criteria stated above.

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