Benzene and Alkyl Benzene - Result Question 27

####31. Which compound(s) out of the following is/are not aromatic? (2019 Main, 11 Jan I) (a)

(c)

(b)

(d)

(c) (i)

(ii)

(ii)

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Solution:

  1. A compound is considered to be aromatic, if it follows three rules:

(a) Must be cyclic and planar.

(b) Must have conjugated system in it.

(c) It must follow Huckel rule which states that number of $\pi$-electrons $=(4 n+2)$

(A) $\nabla^{\square} \Rightarrow 2 \pi-e^{-} \operatorname{system}[(4 n+2) \pi, n=0] \Rightarrow$ Aromatic

(B) ${ }^{5}$ d) $\Rightarrow 4 \pi-e^{-} \operatorname{system}[4 n \pi, n=1] \Rightarrow$ Anti-aromatic

(C) $\underset{\ominus \odot}{1}$

(D) $\begin{aligned} & \Delta p^{3} \text { The } s p^{3} \text {-carbon does not support conjugation and } \ & \text { also devoids planarity. } \ & \Rightarrow \text { Non-aromatic }\end{aligned}$



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