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Q.
Number of following molecules showing planar symmetry
is________.
Organic Chemistry – Some Basic Principles and Techniques
Solution:
(a) is not planar
(b) Ring is planar but hydrogens are not
(c) Benzene is planar
(d) The expected hybridization of $N$ in Pyrrole is $sp ^{3}$ but the unavailability of the lone pair and partial double bond character with $N \equiv C$ bonds, makes this molecule planar.
(e) The expected hybridization of $O$ in furan is $sp ^{3}$ but one of the $2$ lone pairs gets involved in resonance. Hence, the effective hybridization is $sp ^{2}$ which means, furan is planar.
