The relative strength of carboxylic acid, water, ethanol, and phenol has the following order of increasing acid strength:
Correct answer: B. Carboxylic Acid > Phenol > Water > Ethanol
- A. Carboxylic Acid > Phenol > Ethanol > Water
- B. Carboxylic Acid > Phenol > Water > Ethanol
- C. Phenol > Carboxylic Acid > Ethanol > Water
- D. Water > Ethanol > Phenol > Carboxylic Acid
Explanation
The phenoxide ion obtained after the removal of a proton is stabilized by resonance whereas the ethoxide loan obtained after the removal of a proton is destabilized by the effect of the -C2H5 group. Therefore, phenol is a stronger acid than ethanol. Ethanol is a weaker acid than water because the electron releasing -C2H5 group in ethanol increases the electron density on oxygen hence the polarity of the O-H bond in ethanol decreases which results in decreasing acidic strength. Hence, the order of increasing acid strength is:Carboxylic acid > Phenol > Water > Ethanol
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About Carboxylic Acids
Carboxylic acids are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
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