Which one of the following statements is not true for a compound to be considered as aromatic? A. The compound must be cyclic and planar B. The compound must be monocyclic. C. The compound must have a conjugated system with p orbital at every vertex D. The compound must satisfy Hückel's rule -must have (4n + 2)t electrons. E. none of these

Statement that is not true as regards aromatic compound is B:The compound must be monocyclic.

Therefore, option B is correct.

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B

Explanation:

Aromatic compounds are benzene-like compounds. They usually have a characteristic odor and that’s why they are termed aromatic. For a compound to be aromatic, there are some criteria that must be satisfied by the compound in question.

Let’s examine the options to see if they fit.

Option A is correct, aromatic compounds must be cyclic and planar

Option C is correct. There must be conjugation of the pi electron system

Option D is correct, they must possess 4n + 2 pi electrons. This is referred to as the Huckel’s rule

Option B is wrong. This is simply because we have compounds which are not monocyclic and are aromatic. Example of this is anthracene and naphthalene

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally