Only glyoxal CHO - CHO is obtained by the ozonolysis of (a) Cyclobutene (b) 1,3 -butadiene (c) ethyne (d) 2 -butene

Alkene ozonolysis is a vital organic reaction, especially for students preparing for competitive exams like IIT JEE. It involves the cleavage of carbon-to-carbon double bonds using ozone, a strong oxidizing agent. In this process, ozone reacts with an alkene to form a molozonide, which is an unstable intermediate and quickly rearranges to a more stable ozonide. Finally, the ozonide is reduced to give the corresponding carbonyl compounds (aldehydes or ketones).
Ozonolysis is important in structure determination of alkenes as it can identify the position of double bonds within the molecule. When ozonolysis results in the formation of glyoxal (CHO-CHO), it suggests that the original alkene had conjugated double bonds, as in the case of 1,3-butadiene. This is because the cleavage occurs at both ends of the conjugated system, leading to the smallest possible aldehyde, glyoxal. It's crucial to grasp this mechanism, as questions about product identification are common in exams like IIT JEE.

Understanding organic reaction mechanisms is fundamental to mastering organic chemistry. A reaction mechanism provides the step-by-step sequence of elementary reactions by which a chemical change occurs. It illustrates how the reactants are converted into products and which intermediates are formed during the course of the reaction. Such knowledge enables prediction of the outcome of the chemical reactions.
For ozonolysis, the key mechanism stages are the formation of the molozonide and its subsequent rearrangement to the ozonide, before finally being reduced to carbonyl compounds. Learning mechanisms not only helps with solving textbook exercises but also aids in visualizing the changes that occur at a molecular level. Breaking down complex reactions into simpler steps makes it easier for students to grasp, and it is particularly crucial for IIT JEE preparation where complex organic reactions are a significant part of the syllabus.

Students preparing for the IIT JEE must develop a robust understanding of concepts and the ability to apply them to solve problems efficiently. For organic chemistry, this means familiarizing oneself with a variety of reactions, including ozonolysis, and their mechanisms.

Study Strategies for IIT JEE

• Conceptual Clarity: Make sure all underlying principles and reaction mechanisms are well understood, not just memorized.
• Regular Practice: Consistently solve problems and refer to textbook solutions to clarify doubts.
• Mock Tests: Take timed practice exams to improve speed and accuracy.
• Analysis: After solving problems or taking tests, analyze mistakes to avoid repeating them.

Incorporating ozonolysis into study routines is one step further towards mastering organic chemistry. By understanding its application in problem-solving, students can significantly uplift their performance potential for IIT JEE Chemistry.