Organic Compounds Drawing and Physical Tests
Published:
1.
(a) Draw the structure of the following compounds
(i) 2-methylbut-2-ene
(ii) heptanoic acid
(2 marks)
(b) Describe a physical test that can be used to distinguish between hexane and hexanol
(2 marks)
(c) Use the flow chart to answer the questions that follow.
[Partial flow chart visible with $H_{2}O_{(l)}$ and $CH_{3}COOCH_{2}CH_{3(aq)}$]
Handwritten addition:
why pent-2-yne decolourises
c. Study the flow chart below
This question includes visual content: A partial view of a chemistry exam paper and a handwritten notebook. On the printed paper, there is a question numbered 1 with three parts (a, b, c). Part (c) includes a flow chart showing boxes with chemical formulas. One box contains $H_{2}O_{(l)}$ and another contains $CH_{3}COOCH_{2}CH_{3(aq)}$ with arrows pointing between them or from other sources not fully visible. The handwritten section contains the text 'why pent-2-yne decolourises' and 'c. Study the flowchart below'.
Animated Video Solution
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Step by Step Written Solution
In this exercise, we will draw the structures of two organic molecules and then discuss a method to distinguish between an alkane and an alcohol.
Organic Chemistry: Structures and Tests
Let's start with part individual 'a', sub-part 'i': drawing two methyl but-two-ene.
(a) (i) 2-methylbut-2-ene
The parent name 'but-two-ene' tells us there is a four-carbon chain with a double bond starting at the second carbon. '2-methyl' indicates a methyl group attached to that same second carbon.
Now for part 'a', sub-part 'ii': heptanoic acid.
(a) (ii) Heptanoic acid
The name tells us there is a seven-carbon chain with a carboxylic acid functional group at the end.
Let's draw the structural representation to show the carboxyl group more clearly.
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