What is the number of bonds in allyl isocyanide?

Which of the following homologous series has an incorrect general formula?

Compare the rate of catalytic hydrogenation using $H_2 / Pt$ for the following compounds $(a)$ and $(b)$:

Arrange the following compounds in decreasing order of their heats of combustion:

$A$ straight chain hydrocarbon has the molecular formula $C_8H_{10}$. The hybridisation for the carbon atoms from one end of the chain to the other are respectively $sp^3$,$sp^2$,$sp^2$,$sp^3$,$sp^2$,$sp^2$,$sp$ and $sp$. The structural formula of the hydrocarbon would be

Action of hydrogen chloride on $CH_3-C(CH_3)=CH_2$ and on $CH \equiv CH$ will predominantly give the compounds,respectively: