Question

The correct decreasing order for acid strength is a. No2ch2cooh>fch2cooh>cnch2cooh>clch2cooh

Answer 1

No2ch2cooh>cnch2cooh>fch2cooh>clch2cooh is the correct order of acidic strength.

Due to -I effect order is NO2>CN>F>Cl

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Answer 2

Answer:

The decreasing acidity order is:

NO₂CH₂-COOH > CNCH₂-COOH > FCH₂-COOH > ClCH₂-COOH

Explanation:

• Acidity is the ability of molecule to readily donate hydrogen ion.
• This leaves behind a negatively charged ion.
• More the stable anion more readily it can give hydrogen ion off. Thus, stability of anion is directly proportional to the acidity of molecule.
• The anions gets stabilized by resonance effect and -I effect which decreases the charge on anion thus, increasing its stability.
• In this case CH₂ group is common part among all and also apply +I effect.
• The variable part is the side groups NO₂, CN, F AND Cl. All of these apply -I effect in the order NO₂ > CN > F >Cl.
• Thus, the acidity order will also be NO₂CH₂COOH > CNCH₂COOH > FCH₂COOH > ClCH₂COOH

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