Question

Q5. CLASSIFY the following as Aromatic (A), Antiaromatic (AA) or Non-aromatic (NA). Assume planarity of the it network [ Yorku 2020] (2 marks) osa HC=C=CH A) + B)

Answer 1

Aromatic (A) AntiAromatic (AA) Non Aromatis (NA) * Aromatic. (A) The molecule is Aromatic when it obey 4 condition Cycis conjugated C Alternate double bond) Rental T electrons (Huckel's Ruel planod Antiaromatic The molecule is Anti aromatic when it obey the following condition cyclic Planar Conjugated (40) T electrons e ☆ Non-Aromatic of one of 4 criteria any criteria is not obeyed by malllule then this is Non -Aromatic A ис= C-CH яс — с= CH = Hilm Not in H plane CS. Scanned with CamScanner

f The molecule is cyclic. * The molecule is not conjugated. The molewe is non planer * The moleaule also not obey Huckel rue it contain 12 Te Cideally it contain 145e-) from this we get that molecule is Non Aromatic + H B) Ni * * The molecule is Cyclic * The molecule is non conjugated The moleathe is non planar x Molecule obey the Huckel mute of Te-=6 Të from this we conclude that molecule is Non - Aromatic Scanned_with CamScanner

A . The Molecule the is cyclic . But the Molecule not obey the criteria for Aromaticity .

The Molecule is non planar , non conjugated , and also not obey the Huckle rule of Aromaticity .

The given Molecule is = Non - aromatic .

B. The Molecule is cyclic , and obey the Huckle rule of Aromaticity .

But the Molecule is non planar and non conjugated . From this we get that the Molecule is = Non - aromatic .