Isomers

[keliao]

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188. how many isomers (constitutional) can be drawn for C4 H10 O ?
ans. B 7
a.6 b. 7 c.5 d. 8 e. 10

seriously.. do i need to draw all of them out???? is there any shortcut?

 

[Sea of ASH]

sadly, there is no short cut. you gotta draw em out

 

[Maygyver]

It doesn't take that long. Just start out without branching and then add one at a time.

 

[AndyK]

It's also good to know the degree of unsaturation formula:

(2*C + 2 - H)/2 ... in this case (2*4 + 2 - 10) = 0 ... so no double bonds or rings. So the isomers are only saturated alcohols and ethers. After that, just draw it out...

 

[klutzy1987]

I got 7 for my answer. Is that correct??

 

[IWantSmile]

I got 7 for my answer. Is that correct??

Keliao said it is 7 isomers. But I am getting 8 isomers.🙁 Can you explain me how did you get it? please. I draw them out then count the possible location of the Hydrogen for the isomers.

 

[AndyK]

The isomers are:

n-butanol
2-butanol
isobutanol (2-methylpropanol)
t-butanol (2-methyl-2-propanol)

methyl propyl ether (methoxypropane)
diethyl ether (ethoxyethane)
isopropyl methyl ether (2-methyoxypropane)

 

[IWantSmile]

The isomers are:

n-butanol
2-butanol
isobutanol (2-methylpropanol)
t-butanol (2-methyl-2-propanol)

methyl propyl ether (methoxypropane)
diethyl ether (ethoxyethane)
isopropyl methyl ether (2-methyoxypropane)

Yeeik, I saw what I did.

 CH3-CH2-CH-CH3
         |    
        OH  

and 
         CH3-CH2-CH-OH
                  |    
                 CH3

Thanks.