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Questions and Answers
What is the correct IUPAC name for Pentanone?
Which functional group is present in the compound Pentaenal?
Identify the functional group present in an alkyl ketone compound.
In the compound 2-chloro-3-methoxypropanoic acid, what does the chloro group represent?
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What functional group is associated with the hydroxyl group (-OH)?
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In the reaction between sodium bis(2-methylallyl)aluminate and formaldehyde, what intermediate would form first?
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What is the role of sodium bis(2-methylallyl)aluminate in the given reaction?
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In the conversion process described, what intermediate is formed before the final product?
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How does benzenediazonium ion form resonance structures?
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What is the total charge of a benzenediazonium ion?
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Study Notes
Class 12 Chemistry Board Exam MCQs in Organic Chemistry (2024)
As you prepare for your upcoming board examinations, it's essential to familiarize yourself with common multiple-choice questions from the Organic Chemistry section. In this guide, we will delve into some of the potential MCQs based on the latest trends, syllabus, and examination patterns. These examples can help improve your understanding and confidence in tackling the challenging world of organic molecules during your Class 12 Chemistry board exam in 2024.
IUPAC Nomenclature
Question: Which of the following compounds has the correct IUPAC name? A) Pentanone B) Pentaenal C) Pentene-2-one D) Pentyn-2-one Answer: D) Pentyn-2-one Explanation: This compound is an alkyl ketone attached to an alkyne group; hence, its name includes both components according to their positions, yielding the name pentyn-2-one.
Functional Groups
Question: Select the functional groups present in the given compound: 2-chloro-3-methoxypropanoic acid A) Carboxylic Acid B) Chlorine Atom C) Methoxyl Group (-OCH₃) D) Hydroxyl Group (-OH) E) Alkenyl group (double bond) F) Carbonyl Group (C=O) Answer: A), B), C) Explanation: The presence of -COOH and -Cl indicates carboxylic acid and chlorine atom respectively. Additionally, having an OCH₃ group signifies a methoxyl substituent.
Reaction Mechanisms
Question: During the reaction between sodium bis(2-methylallyl)aluminate and formaldehyde, which intermediate would form first? A) Enolate ion B) Grignard reagent C) Aldimine D) Hemiaminal Answer: C) Aldimine Explanation: Sodium bis(2-methylallyl)aluminate acts as an enophile. When reacted with formaldehyde (a nucleophile), they undergo 1,2-addition forming an aldimine intermediate before converting to the final product via the aldol condensation process.
Resonance Structures
Question: How many resonance structures does benzenediazonium ion have? A) One B) Two equally probable structures C) Three equally probable structures D) Four different structures Answer: B) Two equally probable structures Explanation: Benzenediazonium ion contains one positive charge and two electrons (+1e⁻); thus, it forms two equivalent resonance structures by shifting the electron density across double bonds while maintaining aromaticity.
Remember, these samples do not represent exhaustive coverage of all possible MCQs. However, they serve as examples illustrating how questions may be framed in various aspects of organic chemistry. By honing your skills in recognizing key concepts and understanding question formats, you increase your chances of success in your forthcoming board exams. Good luck!
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Description
Prepare for your Class 12 Chemistry board exam in 2024 with a selection of multiple-choice questions focusing on various topics in Organic Chemistry. Explore questions on IUPAC nomenclature, functional groups, reaction mechanisms, and resonance structures to enhance your understanding and readiness for the upcoming examinations.
