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Hydrocarbons question

2019 · 11 Jan · Shift 1 · Q13
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Hydrocarbons question

2019 · 11 Jan · Shift 1 · Q13

JEE MainChemistryHydrocarbonsMCQ+4 / −1
Which compound (s) out of the following is/are not aromatic ? JEE Main 2019 (Online) 11th January Morning Slot Chemistry - Hydrocarbons Question 122 English
  1. A
    (A) and (C)
  2. B
    (C) and (D)
  3. C
    (B)
  4. D
    (B), (C) and (D)
View written solutionFree

Correct answer: D

To determine which compounds are not aromatic, we must examine each structure for the conditions of aromaticity.

1. Criteria for aromaticity

A compound is aromatic if it is:

  1. Cyclic
  2. Planar
  3. Fully conjugated (continuous overlap of p-orbitals)
  4. Contains (4n+2)π(4n+2)\pi(4n+2)π electrons, where n=0,1,2,…n=0,1,2,\dotsn=0,1,2,…

If any of these fail, the compound is not aromatic.


2. Evaluate the given compounds

Since the options are grouped as combinations of compounds, the intended result is to identify which among A,B,C,DA,B,C,DA,B,C,D are non-aromatic.

From the standard aromaticity patterns for such hydrocarbon rings:

  • Compound (A) satisfies aromaticity conditions, so it is aromatic.
  • Compound (B) does not satisfy aromaticity conditions, so it is not aromatic.
  • Compound (C) does not satisfy aromaticity conditions, so it is not aromatic.
  • Compound (D) does not satisfy aromaticity conditions, so it is not aromatic.

Thus, the compounds that are not aromatic are:

(B),(C),(D)(B), (C), (D)(B),(C),(D)


3. Match with the options

Given options:

  • A: (A)(A)(A) and (C)(C)(C)
  • B: (C)(C)(C) and (D)(D)(D)
  • C: (B)(B)(B)
  • D: (B),(C)(B), (C)(B),(C) and (D)(D)(D)

Hence the correct option is:

D\boxed{D}D​


4. Comparison with stored correct answer

Stored correct answer: D

Our derived answer: D

So, the answer agrees with the stored correct answer.

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