Q32 / 180 · AIIMS 2004 · Chemistry
$$
\text { Among the following the aromatic compound is }
$$
- Correct answerA
- B
- C
- D
Solution
(a) 
$4 n+2=2, n=0$ (integer) (b)
$4 n+2=4, n=0.5$ (c)
$; n+2=4, n=0.5$ (d)
$; 4 n+2=4, n=0.5$ $$ \text { Only (a) obeys Huckel's rule. } $$
$4 n+2=2, n=0$ (integer) (b)
$4 n+2=4, n=0.5$ (c)
$; n+2=4, n=0.5$ (d)
$; 4 n+2=4, n=0.5$ $$ \text { Only (a) obeys Huckel's rule. } $$
Hence, the correct answer is option: 'A'.