Huckel's rule of aromaticity says that when there are 4n+2 pi electrons and the n have integer values from 0, then the compound is aromatic. Thus the number of pi electrons 2,6,10, 14, 18 satfies the rule.
Aromaticity is a property of cyclic organic compounds which give them an extra stability. According to the Huckel's rule of aromaticity, the number of pi electrons must satisfy that 4n+ 2 pi electrons with an integer value of n.
Moreover the compound have to be cyclic and planar and the carbons have to be sp3 hybridization. Now, lets check whether the given numbers satisfy the rule or not.
If pi electrons are 2 in number then (4n +2 )= 2, then n=0. rule satisfied.
If 4n+2 = 4, n = 1/2,not satisfied.
If 4n+2 = 6, n= 1 rule satisfied.
Similarly the number with an increment of 4 will satisfy the rule. Therefore, the number of pi electrons, 2,6,10,14, and 18 satisfy the rule.
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