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Some Basic Concepts of Organic Chemistry question

2003 · Q123
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Some Basic Concepts of Organic Chemistry question

2003 · Q123

NEETChemistrySome Basic Concepts of Organic ChemistryMCQ+4 / −1
Which one of the following orders of acid strength is correct ?
  1. A
    RCOOH > ROH > HOH > HC ≡\equiv≡ CH
  2. B
    RCOOH > HOH > ROH > HC ≡\equiv≡ CH
  3. C
    RCOOH > HOH > HC ≡\equiv≡ CH > ROH
  4. D
    RCOOH > HC ≡\equiv≡ CH > HOH > ROH
View written solutionFree

Correct answer: B

Carboxylic acid is much stronger than water and alcohol. Since the carboxylate ion after the removal of proton is stabilised by resonating structures as higher is the tendency to donate proton, stronger is the acid.

The – OH in alcohols is almost neutral.

Acetylene is also weakest acid.

Thus the correct order is

RCOOH > HOH > ROH > HC ≡\equiv≡ CH

depending upon the rate of donation of proton.

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