Consider the reaction
$$CH_2=CH-CH=CH_2 + Br_2 \rightarrow Z$$
Z would be represented by
A - VCE - SSCE Chemistry - Question 6 - 2003 - Paper 1
Question 6
Consider the reaction
$$CH_2=CH-CH=CH_2 + Br_2 \rightarrow Z$$
Z would be represented by
A. $CH_3CHBrCHBrCH_3$
B. $CH_2BrCH(Br)CH_3$
C. $CH_2BrCH(CH_2)CH_2Br$... show full transcript
Worked Solution & Example Answer:Consider the reaction
$$CH_2=CH-CH=CH_2 + Br_2 \rightarrow Z$$
Z would be represented by
A - VCE - SSCE Chemistry - Question 6 - 2003 - Paper 1
Step 1
Identify the Reaction Product
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Answer
In the given reaction, an alkene, specifically 1,3-butadiene (CH2=CH−CH=CH2), reacts with bromine (Br2). This is an electrophilic addition reaction where the double bonds in the alkene will react with bromine, leading to the formation of dibrominated products.
Step 2
Determine the Structure of Z
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Answer
The reaction will add bromine across the double bonds. The most likely product Z will contain bromine atoms on adjacent carbon atoms as they get added to the former double bonds. Considering the provided options:
Option A (CH3CHBrCHBrCH3) shows bromine on the second and third carbon, which is possible.
Option B (CH2BrCH(Br)CH3) and Option C (CH2BrCH(CH2)CH2Br) introduce complications in positional isomerism but can also be possible structures.
Option D (CH3BrCH2CH2Br) suggests the bromine is placed at the terminal positions which does not reflect the correct intermediate stability.
After evaluating the structures, A (CH3CHBrCHBrCH3) emerges as the only plausible product because it conforms with expected stereochemistry and stability.
