Problem 58 - Arihant Objective Approach to Organic Chemistry for IIT JEE and NEET all Medical Entrances Part 4

Question

The compound known as oil of winter green is: |AIIMS 1995\(]\) (a) phenyl acetate (b) phenyl salicylate (c) phenyl bengoate (d) methyl salicylate

Step-by-Step Solution

Answer

Oil of winter green is methyl salicylate, option (d).

Step 1: Understand Oil of Winter Green

Oil of winter green, also called wintergreen oil, is commonly known as methyl salicylate in chemistry. It's an organic ester naturally produced by many species of plants.

Step 2: Analyze the Options

Review the given options: (a) Phenyl acetate (b) Phenyl salicylate (c) Phenyl benzoate (d) Methyl salicylate Out of these, look for the name that matches methyl salicylate.

Step 3: Match with the Correct Option

Identify 'methyl salicylate' among the options, which is option (d). Verify that it matches the chemical known for being oil of winter green.

Key Concepts

Chemical Identification

Chemical identification is a fundamental concept in chemistry, where specific characteristics are used to recognize and distinguish a substance. Identifying a chemical compound like methyl salicylate often involves looking at various attributes such as its chemical formula, structure, and unique properties.
To identify a compound, chemists might use several techniques:

• Chemical Formula: Methyl salicylate has the formula \( C_8H_8O_3 \), which provides information on the number and type of atoms present.
• Functional Groups: By examining the functional groups, such as esters in methyl salicylate, chemists can narrow down the compound's identity.
• Spectroscopy: Methods like NMR or IR spectroscopy can offer insights into the molecular structure based on the interaction of the compound with electromagnetic radiation.

Chemical identification is important because knowing precisely what a substance is helps ensure its correct use, handling, and safety.

Organic Esters

Organic esters are a class of chemical compounds derived from carboxylic acids and alcohols. When they react, they form an ester linkage, characterized by the -COO- functional group.
They have unique characteristics:

• Pleasant Smells: Many esters, including methyl salicylate, are known for their fruity or floral fragrances, making them popular in perfumes and flavorings.
• Formation: They are formed through a reaction called esterification, usually involving the removal of water when an acid and an alcohol combine.
• Uses: Beyond fragrances, esters are used in making polymers and as solvents in chemical reactions because of their adaptable nature.

This diverse usefulness is what makes organic esters so valuable, extending their applications from industrial processes to culinary enhancements.

Plant-Derived Compounds

Plant-derived compounds encompass a wide range of substances that plants naturally produce. These compounds serve various purposes for the plants themselves and hold numerous applications for humans.
Methyl salicylate is a well-known plant-derived compound, identified in nature particularly in species like wintergreen. Key features of plant-derived compounds include:

• Defense Mechanisms: Many compounds help protect plants against predators and diseases.
• Ecological Roles: They can attract pollinators or repel herbivores.
• Medicinal Uses: Humans have harnessed these compounds for therapeutic applications, with methyl salicylate acting as a counterirritant in topical pain relief medications.

The study and utilization of plant-derived compounds are integral to both ecological studies and pharmaceutical development.