Comprehension
An organic compound P with molecular formula C9H18O2 decolorizes bromine water and also shows positive iodoform test. P on ozonolysis followed by treatment with H2O2 gives Q and R. While compound Q shows positive iodoform test, compound R does not give positive iodoform test. Q and R on oxidation with pyridinium chlorochromate (PCC) followed by heating give S and T, respectively. Both S and T show positive iodoform test.
Complete copolymerization of 500 moles of Q and 500 moles of R gives one mole of a single acyclic copolymer U. [Given, atomic mass: H =1, C = 12, O =16]
Complete copolymerization of 500 moles of Q and 500 moles of R gives one mole of a single acyclic copolymer U. [Given, atomic mass: H =1, C = 12, O =16]
Question: 1
Sum of number of oxygen atoms in S and T is _____.
Sum of number of oxygen atoms in S and T is _____.
Updated On: Mar 9, 2025
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Correct Answer: 2
Solution and Explanation
Analysis of Compound P and Reaction Pathway
Step 1: Analysis of Compound P
Compound P reacts with bromine water, indicating unsaturation. Additionally, P gives a positive iodoform test, suggesting the presence of a methyl ketone group (\( \text{CH}_3\text{CO} \)) or a secondary alcohol with a methyl group.
Step 2: Ozonolysis of P
Ozonolysis of P yields two products: Q and R.
- Q: Gives a positive iodoform test, confirming the presence of a methyl ketone group.
- R: Does not give a positive iodoform test, indicating the absence of a methyl ketone group.
Step 3: Oxidation of Q and R
Both Q and R are oxidized using PCC, producing S and T, respectively.
- S and T: Both give positive iodoform tests, confirming the presence of \( \text{CH}_3\text{CO} \) groups.
- S and T: Each contains one oxygen atom.
Step 4: Total Oxygen Atoms in S and T
Each compound contributes one oxygen atom, so the total number of oxygen atoms in S and T is:
\[ \text{Total oxygen atoms} = 2 \]
Final Answer:
The total number of oxygen atoms in S and T is: 2
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Question: 2
The molecular weight of U is ____.
The molecular weight of U is ____.
Updated On: Mar 9, 2025
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Correct Answer: 102018
Solution and Explanation
Copolymerization and Molecular Weight Calculation
Step 1: Copolymerization of Q and R
The polymer formed is poly \( \beta \)-hydroxy butyrate-co-\( \beta \)-hydroxy valerate.
Step 2: Calculate the Molecular Weight
If the number of moles is 500, the molecular mass of the polymer is calculated as follows:
\[ \text{Molecular Weight} = (104 + 118) \times 500 - 999 \times 18 = 93018 \, \text{g/mol} \]
Final Answer:
The molecular weight of the polymer is \( 93018 \, \text{g/mol} \).
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