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Out of the following compounds . I. Pe...

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

A

`(IV)` and `(I)`, respectively

B

`(I)` and `(IV)`, respectively

C

`(II)` and `(III)`, respectively

D

`(III) and `(II)`, respectively

Text Solution

Verified by Experts

The correct Answer is:
A
More`-` stable or more `-` substituted alkene has the lowest (more negative `(DeltaH_(C)^(@), DeltaH_("formation")`, and `DeltaH_(h)^(@))`
The order of stability of alkene `:IV gt III gt II gt I`.
So the lowest `Deltah_(C)^(@)` is to `(IV)` and the highest is of `(I)`.
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