MCQ
The aromatic compound among the following is:
- A
- B
- C
- DAll of these.
Explanation:
A planar cyclic molecule having (4n+ 2) electrons is generally aromatic. Thus, all given options because of the presence of $6\pi$ electrons are aromatic.
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${N_2}{O_4}(g)\, \to \,2N{O_2}(g)$
Data for the given reaction is
$\Delta H = +54\,kJ$ and $E_a = + 57.2\,kJ$
.......$kJ$

$(A)\, n = 5, m_l= + 1$
$(B)\, n =2, l =1, m_l= -1, m_s = -1/2$
The maximum number of electron$(s)$ in an atom that can have the quantum numbers as given in $(A)$ and $(B)$ are respectively