Out of the following compounds , I)Pent-1-ene , II)Pent-2-ene , III)2-Methyl but-1-ene , IV) 2-Methyl but-2-ene . Which pair has the lowest and the highest heats of combustion , respectively ?

Options

A. (IV) and (I), respectively
B. (I) and (IV), respectively
C. (II) and (III), respectively
D. (III) and (II), respectively

Answer

A

Explanation

More-stable or more-substituted alkene has the lowest (more negative) `DeltaH_(c)^(@)`.
The order of stability of alkene : `IVgtIIIgtIIgtI`.
So the lowest `DeltaH_(c)^(@)` is of (IV) and the highest is of (I).