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Q68 (CGS/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Which of the following are characteristics of aromatic compounds?

I. They should be planar.

II. They should follow (4n + 2) π-electrons rule.

III. They should be cyclic.

Select the correct answer using the code given below.

Result
Your answer: —  ·  Correct: D

Explanation

For a compound to be classified as aromatic, it must fulfill four specific criteria:

  1. Cyclic: The molecule must contain one or more rings of atoms.
  2. Planar: The molecule must be flat (planar) so that p-orbitals can align and overlap to form a continuous π-system.
  3. Complete Conjugation: Every atom in the ring must possess an unhybridized p-orbital.
  4. Hückel's Rule: The system must contain (4n + 2) π-electrons, where n is a non-negative integer (0, 1, 2, ...).
Benzene (C6H6) is the most common example, having 6 π-electrons (n = 1). If a cyclic, planar, and conjugated system has 4n π-electrons, it is considered anti-aromatic. Since all three statements (I, II, and III) are essential requirements for aromaticity, the correct answer is D.
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SIMILAR QUESTIONS

CAPF · 2020 · Q25 Relevance score: -1.91

Which one of the following is NOT a heterocyclic aromatic compound ?

CDS-I · 2019 · Q118 Relevance score: -2.04

Match List - I with List - II and select the correct answer using the code given below the Lists : List - I List - II (Compound/Molecule) (Shape of Molecule) I. CH3F 1. Trigonal planar II. HCHO 2. Tetrahedral III. HCN 3. Trigonal pyramidal IV. NH3 4. Linear Code : I II III IV

CDS-I · 2018 · Q29 Relevance score: -4.31

Which one of the following is not a characteristic of a compound?