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When two organic compounds A and B react together in the presence of conc. H2SO4, a fruity smell evolved from one of the products. If A has the functional group [-O-H], which of the following stands for the functional group of B?

    1.
When two organic compounds A and B react together in the presence of conc. H2 SO4, a fruity smell evolved from one of the products. If A has the functional group [-O-H], which of the following stands for the functional group of B? Chemistry Competency Focused Practice Questions Class 10 Solutions.
    2.
When two organic compounds A and B react together in the presence of conc. H2 SO4, a fruity smell evolved from one of the products. If A has the functional group [-O-H], which of the following stands for the functional group of B? Chemistry Competency Focused Practice Questions Class 10 Solutions.
    3.
When two organic compounds A and B react together in the presence of conc. H2 SO4, a fruity smell evolved from one of the products. If A has the functional group [-O-H], which of the following stands for the functional group of B? Chemistry Competency Focused Practice Questions Class 10 Solutions.
    4.
When two organic compounds A and B react together in the presence of conc. H2 SO4, a fruity smell evolved from one of the products. If A has the functional group [-O-H], which of the following stands for the functional group of B? Chemistry Competency Focused Practice Questions Class 10 Solutions.

Organic Chemistry

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Answer

    3.
When two organic compounds A and B react together in the presence of conc. H2 SO4, a fruity smell evolved from one of the products. If A has the functional group [-O-H], which of the following stands for the functional group of B? Chemistry Competency Focused Practice Questions Class 10 Solutions.

Reason — When an alcohol (–OH group) reacts with a carboxylic acid (–COOH group) in the presence of concentrated sulphuric acid, an ester is formed. Esters have a pleasant fruity smell. So, since A is an alcohol, B must be a carboxylic acid.
Example:

C2H5OHethanol+CH3COOHacetic acid→ΔConc. H2SO4CH3−COO−C2H5ethyl acetate+H2O\underset{\text{ethanol}}{\text{C}2\text{H}5\text{OH}} + \underset{\text{acetic acid}}{\text{CH}3\text{COOH}} \xrightarrow[\Delta]{\text{Conc. H}2\text{SO}4} \underset{\text{ethyl acetate}}{\text{CH}3-\text{COO}-\text{C}2\text{H}5} + \text{H}_2\text{O}

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