Preparation of alkenes from alcohols

[ChemDoodle]

Q. Draw the structure for all possible alkenes & the alcohols from which they can be prepared.

CH3-CH=CH-CH2-CH3 <---- CH3-CHOH-CH2-CH2-CH3

CH2=CH-CH2-CH2-CH3 <---- CH2OH-CH2-CH2-CH2-CH3

Both in the presence of H+ & heat.

I also drew Cyclopentanol from which we can prepare Cyclopentene.

Are these all the possible pentenes? And are these equations correct?

Thankyou (:

 

[Lok]

I suppose they need to have 5 C atoms , as if not the possibilities would be cosmological :P.

 

[Borek]

There is a third pentanol which you have not included.

There are also branched pentenes - but whether they count may depend on the exact wording of the question.

Plus zillions of compounds with other number of carbons

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methods

 

[ChemDoodle]

I suppose they need to have 5 C atoms , as if not the possibilities would be cosmological :P.

Haha Yeaa..I meant pentenes not alkenes :P :$

 

[chemisttree]

Q. Draw the structure for all possible alkenes & the alcohols from which they can be prepared.

CH3-CH=CH-CH2-CH3 <---- CH3-CHOH-CH2-CH2-CH3

CH2=CH-CH2-CH2-CH3 <---- CH2OH-CH2-CH2-CH2-CH3

Both in the presence of H+ & heat.

I also drew Cyclopentanol from which we can prepare Cyclopentene.

Are these all the possible pentenes? And are these equations correct?

Thankyou (:

Good so far, but incomplete. For example you can get to CH₂=CH-CH₂-CH₂-CH₃ from two precursor alcohols (and you have written them both) and you can get to CH₃-CH=CH-CH₂-CH₃ from two precursor alcohols, one of which you have shown and one is not shown.

And of course there are the isomers that Borek mentioned as well.