Q49 / 170 · Manipal (MET) 2019 · Chemistry

$\mathrm{C}_6 \mathrm{H}_6$ consists of one ring, while naphthlene consists of two rings. Both of them are aromatic and obey the $(4 n+2)$ rule. Thus the number of $\pi$-electrons inside rings of $\mathrm{C}_6 \mathrm{H}_6$ and naphthalene are respectively

  • A
    3,5
  • B
    5,10
  • Correct answer
    C
    6,10
  • D
    6,12

Solution

Benzene, $(4 n+2) \pi$ electrons $n=1$ ( $6 \pi$ electrons) Naphthalene, $(4 n+2) \pi ; n=2,10 \pi$ electrons Both obey Huckel's rule.

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

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