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Chapter 8: Q49P (page 364)

a.What is the value of nin Hückel’s rule when a compound has nine pairs of π electrons?

b. Is such a compound aromatic?

Short Answer

Expert verified

(a)The value of n will be 4.

(b) The compound is aromatic.

Step by step solution

01

Measurement of aromaticity

Aromaticity of a compound can be measured through theHückel’s rule, which is stated thatfor a planar, cyclic compound to be aromatic, its uninterrupted π cloud must contain (4n+ 2) π electrons, where nis any whole number. According to Hückel’s rule, then, an aromatic compound must have 2 (n= 0), 6 (n= 1), 10 (n= 2), 14 (n= 3), 18 (n= 4), and so on, π electrons.

02

explanation

(a) If a compound has 9 pairs of π electrons, according to Hückel’s rule of (4n+2) π electrons, the value of n will be

(4n+ 2) π = 18π (9 pairs of electrons means 18 electrons).

n= 4

(b) Putting the value of n=4, it satisfies the Hückel’s rule of aromaticity. So, the compound is aromatic.

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