The major product obtained in the following reaction is
The Correct Option is A
Solution and Explanation
In the given reaction, DIBAL-H will act as a strong reducing agent. It is used for the conversion of lactones into functional groups like aldehyde and alcohols.
The reduction of lactones with DIBAL-H gives mainly aldehydes. For this the hydride ion from DIBAL-H is transferred to the function group of lactone.
The correct option is option (a): 
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Concepts Used:
Preparation - Aldehydes, Ketones and Carboxylic Acids
Aldehydes, ketones, and carboxylic acids are organic compounds that can be prepared by a variety of methods.
Preparation of Aldehydes:
Aldehydes can be prepared by the oxidation of primary alcohols using mild oxidizing agents such as pyridinium chlorochromate (PCC) or by the ozonolysis of alkenes followed by reductive workup. Another method involves the dehydrogenation of alcohols in the presence of a dehydrogenating agent like pyridinium chlorochromate (PCC).
Preparation of Ketones:
Ketones can be prepared by the oxidation of secondary alcohols using oxidizing agents such as potassium permanganate (KMnO4), chromium trioxide (CrO3), or by the ozonolysis of alkenes followed by oxidative workup. Another method involves the Friedel-Crafts acylation of aromatic compounds.
Preparation of Carboxylic Acids:
Carboxylic acids can be prepared by the oxidation of primary alcohols or aldehydes using strong oxidizing agents such as potassium permanganate (KMnO4) or chromic acid (H2CrO4). Another method involves the hydrolysis of nitriles, which produces carboxylic acids and ammonia. Additionally, carboxylic acids can be prepared from Grignard reagents by reacting with carbon dioxide followed by acidic hydrolysis.
In summary, aldehydes, ketones, and carboxylic acids can be prepared by various methods, including oxidation, ozonolysis, and hydrolysis. Understanding the preparation methods of these compounds is important for predicting their behavior and understanding their potential applications in various fields, including chemistry, biology, and industry.