Q70 / 200 · NEET 2023 (All India) · Chemistry

(i) Figure  (ii)  Figure (iii) Figure (iv) Figure

(v) Figure (vi) Figure (vii)  Figure

The number of compounds/species which obey Huckel's rule is _____

  • A
    5
  • Correct answer
    B
    4
  • C
    6
  • D
    2

Solution

Criteria for Huckel’s rule:

(i) Planarity-The molecule must be planar.

(ii) Complete delocalisation of π electrons

(iii) Presence of (4n + 2)π electrons in ring where n is an integer (n = 0, 1, 2, …). If the molecule has a number of π electrons that satisfies this rule, then it is considered to be aromatic. If the number of π electrons does not satisfy this rule, then the molecule is considered to be non-aromatic.

The compounds which follow Huckel’s rule are:

Figure

Hence, the correct answer is option: 'B'.

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