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 : `IV gt III gt II gt I`
So the lowest `DeltaH_c^@` is of (IV) and the highest is of (I).