Consider the reactions represented in the flow diagram below - NSC Physical Sciences - Question 4 - 2017 - Paper 2
Question 4
Consider the reactions represented in the flow diagram below.
1. reaction 1
2. Alcohol A
3. concentrated H₂SO₄
4. Compound B (An alkene)
5. C₄H₈Br₂
Write down:
4.... show full transcript
Worked Solution & Example Answer:Consider the reactions represented in the flow diagram below - NSC Physical Sciences - Question 4 - 2017 - Paper 2
Step 1
4.1.1 Type of reaction represented by reaction 1
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Answer
The type of reaction represented by reaction 1 is a substitution reaction (or hydrolysis).
Step 2
4.1.2 NAME or FORMULA of the inorganic reactant needed for reaction 1
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The inorganic reactant needed for reaction 1 is water (H₂O) or it can also be dilute sodium hydroxide (NaOH) or dilute potassium hydroxide (KOH).
Step 3
4.1.3 Type of alcohol (PRIMARY, SECONDARY or TERTIARY) of which alcohol A is an example
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Alcohol A is an example of a tertiary alcohol.
Step 4
4.1.4 Type of reaction represented by reaction 2
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The type of reaction represented by reaction 2 is elimination (dehydrohalogenation or dehydrobromination).
Step 5
4.1.5 IUPAC name of compound B
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The IUPAC name of compound B is 2-methylprop-1-ene or methylpropene.
Step 6
4.1.6 Type of addition reaction represented by reaction 3
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The type of addition reaction represented by reaction 3 is halogenation (bromination).
Step 7
4.1.7 Balanced equation for reaction 3 using structural formulae
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Answer
The balanced equation for reaction 3 using structural formulae is as follows:
H H H H
| | | |
H--C===C--Br--C--H
| | | |
H H H H
This shows the formation of C₄H₈Br₂ from the alkene and bromine.
