1,2 Benzpyrene is a carcinogenic compound. It contains

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4 benzene rings and 8 $π$ bonds

4 benzene rings and 1 Cyclo pentane ring

5 benzene rings and 10 $π$ bonds

5 benzene rings and 13 $π$ bonds

answer is C.

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Detailed Solution

5 benzene rings and 10 π bonds

Detailed Explanation:

1,2-Benzpyrene is a polycyclic aromatic hydrocarbon (PAH) and a known carcinogenic compound. Its structure is composed of:

5 benzene rings fused together in a specific arrangement.
10 π bonds that arise from the delocalized electrons in the aromatic rings.

The compound exhibits planar aromaticity, meaning all the rings lie in the same plane. This property, along with the π electron delocalization, contributes to its chemical stability and reactivity.

Concept Behind Carcinogenic Nature:

1,2-Benzpyrene itself is not directly carcinogenic. However, it undergoes metabolic activation in the body to form reactive intermediates like epoxides. These intermediates can bind to DNA, causing mutations that disrupt normal cellular processes. Such mutations are a key factor in the development of cancer.

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