In the following reactions, P, Q, R, and S are the major products.
The correct statement(s) about P, Q, R, and S is(are)
The correct statement(s) about P, Q, R, and S is(are)
- P and Q are monomers of polymers dacron and glyptic, respectively.
- P, Q, and R are dicarboxylic acids.
- Compounds Q and R are the same.
- R does not undergo aldol condensation and S does not undergo Cannizzaro reaction.
The Correct Option is C, D
Approach Solution - 1
Analyzing the given reactions, we aim to identify the major products P, Q, R, and S.
1. Reaction Observation:
- The reaction provided involves the conversion of starting materials to products P, Q, R, and S based on typical organic chemistry reaction mechanisms.
2. Product Analysis:
- P and Q: The structure of Q is typical for a dicarboxylic acid that becomes a precursor for polyester synthesis, such as polyethylene terephthalate (PET)—known as Dacron.
- R: The lack of α-hydrogens in R suggests it cannot undergo aldol condensation, a typical feature of aldehydes or ketones with α-hydrogens.
- S: Lacking both α-hydrogens in aldehydes, S can't undergo the Cannizzaro reaction, which requires non-enolizable aldehydes for disproportionation into alcohol and carboxylate.
3. Statement Verification:
- P and Q are monomers of polymers Dacron and Glyptic, respectively: Incorrect. P might serve a polymeric role, but Q overlaps as a polyester precursor.
- P, Q, and R are dicarboxylic acids: Incorrect. While Q may be a dicarboxylic acid, P and R's identities likely differ.
- Compounds Q and R are the same: Correct. Reaction conditions and structures point this out.
- R does not undergo aldol condensation and S does not undergo Cannizzaro reaction: Correct, given their structural limitations.
Conclusion:
The correct statements are: "Compounds Q and R are the same." and "R does not undergo aldol condensation and S does not undergo Cannizzaro reaction."
Approach Solution -2
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Concepts Used:
Stoichiometry
Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products, leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of the products can be empirically determined, then the amount of the other reactants can also be calculated.
Stoichiometry helps us determine how much substance is needed or is present. Things that can be measured are;
- Reactants and Products mass
- Molecular weight
- Chemical equations
- Formulas
Stoichiometric Coefficient
The Stoichiometric coefficient of any given component is the number of molecules and/or formula units that participate in the reaction as written.
Mole Ratios
The mass of one mole of a substance in grams is called molar mass. The molar mass of one mole of a substance is numerically equal to the atomic/molecular formula mass.