Which of the following pairs of structural formulae represent structural isomers?
1 CH3CH2OH and CH3OCH3
2 CH3CH(CH3)CH2CH2CH3 and CH3CH2CH2CH(CH3)CH3
3 CH(OH)=CHCH2OH and CH3CH2COOH
A.2 only
B.1 only
C.1, 2 and 3
D.1 and 3 only
E.2 and 3 only
Can anyone explain to me why option 2 aren’t isomers? The methyl group is on different carbons so the same formula but different arrangement. I’d say the first is 2-methyl pentane and the other 1-methyl pentane. Correct answer is D
Both of them are the same ie 2 Methyl Pentane.
Write skeletal formula for both the structures and you’ll find that the longest chain in both cases is 5C alkane with methyl attached to second carbon.
@AriHoresh
Question Shouldn’t answer be A instead of D
Shouldn’t 1 and 3 be functional group isomers while 2 be structural isomer as the q asks only structural isomer,Please guide
functional isomers are part of structural isomers, 2 is not even an isomer its the same molecule
Useful key is
*Alcohol+ ethere
*Aldehyde+ketone
*Carboxylic acid+ ester
There are three types of structural isomers: chain, positional, and functional group
So functional is just a tipe of structural isomere