How many structural isomers have the molecular formula
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How many structural isomers have the molecular formula
Isomers are:
How many structural isomers have the molecular formula
→ Structural Isomers will have the same molecular formula but different structures.
→ The fluoride Ions can exists at different points on the carbon chain, changing the name and structure of the compound without altering its molecular formula.
Some isomers with the formula
Name ONE pair of functional group isomers and ONE pair of chain isomers from the structures above. (2 marks)
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Functional Group: Butan-2-one and butanal
Chain: Butanal and 2-methylpropanal
Functional Group: Butan-2-one and butanal
Chain: Butanal and 2-methylpropanal
Draw the structural formulae and name all possible isomers of hexane. (3 marks)
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How many isomers are there of
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a. Successful answers should have one of the following:
b. Functional Group isomers
→ Both isomers have the same number and type of atoms, but they have different arrangements of those atoms and therefore have different functional groups.
→ Isomer A has a ketone functional group, while isomer B has an aldehyde functional group.
c. Tollens’ Test:
→ The Tollens’ test can be used to differentiate between Isomer A (a ketone) and Isomer B (an aldehyde).
→ Isomer B will be readily oxidised to a carboxylic acid, whereas isomer A will not.
→ As a result, Isomer B will reduce the silver-ions in Tollens’ reagent to form a silver mirror inside the test tube, while Isomer A will not react.
a. Successful answers should have one of the following:
b. Functional Group isomers
→ Both isomers have the same number and type of atoms, but they have different arrangements of those atoms and therefore have different functional groups.
→ Isomer A has a ketone functional group, while isomer B has an aldehyde functional group.
c. Tollens’ Test:
→ The Tollens’ test can be used to differentiate between Isomer A (a ketone) and Isomer B (an aldehyde).
→ Isomer B will be readily oxidised to a carboxylic acid, whereas isomer A will not.
→ As a result, Isomer B will reduce the silver-ions in Tollens’ reagent to form a silver mirror inside the test tube, while Isomer A will not react.
The structures of four isomers are shown.
Which statement is correct?
Consider each option:
→ Chain isomers have a different structure of the
→ Positional isomers have the same
→ Functional group isomers occur when atoms form different functional groups. Compound 2 has a double bond and an OH group, whereas Compound 3 only contains an ester group (correct).
A bottle labelled 'propanol' contains one of two isomers of propanol.
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a. Isomer 1:
Isomer 2:
b. Identifying isomers with
→ this can be used to identify the isomers in the bottle because they show a different number of signals which helps deduce the carbon environment.
→ Propan-1-ol contains 3
c.
a. Isomer 1:
Isomer 2:
b. Identifying isomers with
→ this can be used to identify the isomers in the bottle because they show a different number of signals which helps deduce the carbon environment.
→ Propan-1-ol contains 3
c.
A straight-chained alkane has a molar mass of 72.146 g mol ¯1.
Provide the structural formulae for this alkane and all of its isomers.
Name these molecules using IUPAC conventions. (4 marks)
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Straight chained alkane (Pentane):
2-methylbutane:
2,2-dimethylpropane:
Straight chained alkane (Pentane):
2-methylbutane:
2,2-dimethylpropane: