Experiments were carried out on several different cracking reactions of butane (semi-structural formula of butane is CH₃CH₂CH₂CH₃) - VCE - SSCE Chemistry - Question 3 - 2004 - Paper 1
Question 3
Experiments were carried out on several different cracking reactions of butane (semi-structural formula of butane is CH₃CH₂CH₂CH₃). The following series of different... show full transcript
Worked Solution & Example Answer:Experiments were carried out on several different cracking reactions of butane (semi-structural formula of butane is CH₃CH₂CH₂CH₃) - VCE - SSCE Chemistry - Question 3 - 2004 - Paper 1
Step 1
i. V
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Answer
V is produced from the cracking of butane and reacts with Cl₂ to form CH₃CHClCH₂CH₃. Thus, the semi-structural formula for V is:
V: CH₃CH₂CH₂Cl (1-chlorobutane)
Step 2
ii. W
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W is formed in the reaction between butane and V, and given that V is CH₃CH₂CH₂Cl, W should have the same formula as butane but without Cl. Therefore, the semi-structural formula for W is:
W: CH₃CH₂CH₃ (propane)
Step 3
iii. X
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X has the same molecular formula as V but a different structure. Since V is CH₃CH₂CH₂Cl, X could be chlorobutane with a different branch. Thus, the semi-structural formula for X is:
X: CH₃CHClCH₃ (2-chlorobutane)
Step 4
iv. Y
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Y, when reacted with H₂O, forms CH₃CH₂CH₂OH, suggesting that Y must be a form of an alkene. Hence, the semi-structural formula for Y is:
Y: CH₃CH=CH₂ (propene)
Step 5
v. Z
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Z is formed from the reaction with Y and is sequentially the alcohol product from propene reacting with water. Thus, the semi-structural formula for Z is:
