Explanation
As the conjugation increases, heat of hydrogenation decreases. Thus , alkene (c) with 2 isolated double bonds has the highest heat of hydrogenation.
When C is bonded to four other atoms, the angle between any pair of bonds =109o28’ , but the ring of cyclobutane is square with four angles of 90o.
Therefore, Deviation of bond angle in cyclobutane
= (109o28’ - 90o)/2
= 19o28’/2 = 9o44’
Aromatic compound example C6H6 give sooty flame on combustion.
Benzene burns with sooty flame because it is an unsaturated compound . In unsaturated compound , C- extent is more than hydrogen.
A compound is said to be aromatic if it meets of the following .
The presence of the chlorine atom on benzene ring makes the second substituent enter at ortho or para position because the chlorine atom is ortho – para directing .
Aromatic compounds have delocalised π-electrons out of given choices cyclohexane, CH4 , C2H6 and benzene only benzene is aromatic compound . Benzene has 6 delocalised π-electrons.
Boiling Point ∝ Molecular mass ∝ 1/branching
As the surface area decreases . Therefore , n-hexane has the highest boiling point.
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