Chemistry - GOC Question with Solution | TestHub
Given below are two statements. One is labelled as Assertion and the other is labelled as Reason .
Assertion Annulene. Annulene and cis Annulene, are respectively aromatic, not-aromatic and aromatic.
Reason : Planarity is one of the requirements of aromatic systems.
In the light of the above statements, choose the most appropriate answer from the options given below.
Options:
Answer:
Solution:
In -Annulene - the hydrogen atoms in the and position interfere with each other and force the molecule out of planarity
If this annulene with five cis double bonds were planar, each internal angle would be . Since a normal double bond has bond angle of , this would be from ideal. This compound can be made but it does not adopt a planar conformation and therefore is not aromatic even though it has ten electrons.
