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Isomers (position and functional group)

Hey I can't work out the difference for the following 2 Q's:

Draw and name a position isomer of but-1-ene
Draw and name a functional group isomer of but-1-ene

I know there should be a double bond somewhere. But can't draw the flipping things :frown:

any help would be great :yy:

oh and rep offered. :o:

Reply 1

fait

Positional isomer means the position of the double bond is different. So a positional isomer would be but-2-ene.

A functional group isomer has the same molecular formula, but they have different functional groups. e.g ethanol and ethoxyethane
A functional group isomer of but-1-ene would be cyclobutane. :smile:

Reply 2

Malsy

OP

18

thanks!!!!!

we haven't touched much on the functional group isomers yet..that's why twas confusing :rolleyes:

Reply 3

Malsy

OP

18

Oh btw could you just elaborate a bit more on how you came to call it cyclobutane ?

Reply 4

fait

Don't worry, it's pretty awkard to learn especially if you haven't covered much Organic Chemistry. :p:

The isomer is called cyclobutane because they both have the same molecular formula

C_4H_8

but they have different functional groups and belong to different homogolous series. Cyclobutane is an alkane, whereas but-1-ene is an alkene. I think it's the only possible functional group isomer of but-1-ene, that's why.

Reply 5

EierVonSatan

21

fait

I think it's the only possible functional group isomer of but-1-ene, that's why.

There's one other - methylcyclopropane :smile:

Reply 6

Sanjetti

9

fait

Don't worry, it's pretty awkard to learn especially if you haven't covered much Organic Chemistry. :p:

The isomer is called cyclobutane because they both have the same molecular formula

C_4H_8

but they have different functional groups and belong to different homogolous series. Cyclobutane is an alkane, whereas but-1-ene is an alkene. I think it's the only possible functional group isomer of but-1-ene, that's why.

Hang on, is cyclobutane an alkane? I thought it was saturated, but not belonging to the homologus series of alkanes (i.e. does not adhere to the CnH2n+2 formula).

Reply 7

IChem

11

Malsi101

Oh btw could you just elaborate a bit more on how you came to call it cyclobutane ?

It's because the carbon atoms are arranged in such a way that they form a cycle. For more information: http://en.wikipedia.org/wiki/Cyclobutane

Reply 8

Malsy

OP

18

argghhhhh confusing although your explanations were great and simple :o:

Reply 9

Malsy

OP

18

ahaaa right thanks!!!!!!!!

Reply 10

IChem

11

Sanjetti

Hang on, is cyclobutane an alkane? I thought it was saturated, but not belonging to the homologus series of alkanes (i.e. does not adhere to the CnH2n+2 formula).