1
Question
The correct combination of names for isomeric alcohols with molecular formula C4H10O is / are
The correct combination of names for isomeric alcohols with molecular formula C4H10O is / are
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Solution
The correct option is D iso-butyl alcohol and 2-methylpropan-1-ol
We need to draw the structure of each isomeric form that is possible and write the IUPAC name.
To get the various isomeric forms, we will use the methods discussed like
- changing the chain length which gives chain isomers
- changing the position of the alkyl group or functional group within the chain which gives position isomers
- changing the functional group itself which would give us functional isomers but in this case, we need only alcohols.
If we do that, we will end up with the following.
Formula
Names
CH3CH2CH2CH2OH
n-butyl alcohol / n-butanol / butan-1-ol
CH3−CH|CH3−CH2−OH
Iso-butyl alcohol / 2-methyl propan-1-ol
CH3−CH2−CH|CH3−OH
Secondary butyl alcohol / butan-2-ol
CH3−CH3|C|CH3−OH
Tertiary butyl alcohol / tert-butanol / 2-methyl propan-2-ol
We need to draw the structure of each isomeric form that is possible and write the IUPAC name.
To get the various isomeric forms, we will use the methods discussed like
- changing the chain length which gives chain isomers
- changing the position of the alkyl group or functional group within the chain which gives position isomers
- changing the functional group itself which would give us functional isomers but in this case, we need only alcohols.
If we do that, we will end up with the following.
| Formula | Names |
| CH3CH2CH2CH2OH | n-butyl alcohol / n-butanol / butan-1-ol |
| CH3−CH|CH3−CH2−OH | Iso-butyl alcohol / 2-methyl propan-1-ol |
| CH3−CH2−CH|CH3−OH | Secondary butyl alcohol / butan-2-ol |
| CH3−CH3|C|CH3−OH | Tertiary butyl alcohol / tert-butanol / 2-methyl propan-2-ol |
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