For question 6, there are no lone pairs so there is no hydrogen bonding; there is if its an alcohol due to the OH group but alkanes have only van der Waals. as you increase the chain length you have more points of contact so the van der Waals forces increases. Also cyclic alkenes do improve combustion because they are weaker so easier to break for somplete combustion. however this also reduces the harmful fumes aka Carbon monoxide- which is produced when incomplete combustion happens often with aliphatic alkenes.
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