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Chemistry Question on Aldehydes, Ketones and Carboxylic Acids

Among P,Q,RP, Q, R and SS, the aromatic compounds(s) is/are

A

P

B

Q

C

R

D

S

Answer

S

Explanation

Solution

PLAN A species is said to have aromatic character if
(a) ring is planar
(b) their is complete delocalisation of π−\pi - electrons
(c) Huckel rule i.e. (An + 2) rule is followed,
where, n is the number of rings
(4n + 2) = π\pi electron delocalised.
In all cases there is complete delocalisation of π−\pi- electrons.
\begin{array}\ &n&(4n+2)&\pi\ electrons\\\P\ \ \ -&0&\ \ \ \ \ \ 2&2\\\Q\ \ \ -&1&\ \ \ \ \ \ 6&6 (including\ lone\ pair)\\\ R\ \ \ -&1&\ \ \ \ \ \ 6&6 (including\ lone\ pair\ on\ N)\\\S\ \ \ -&1&\ \ \ \ \ \ 6&6\\\\\end{array}