Consider the substituted acetic acids: (1) , (2) , (3) , (4) , (5) , (6) . If arranged in decreasing order of acidic strength, what is the position (1st, 2nd, etc.) of ?

Question

Consider the substituted acetic acids: (1) $F_3C-COOH$, (2) $Cl_3C-COOH$, (3) $Cl_2CH-COOH$, (4) $FCH_2-COOH$, (5) $ClCH_2-COOH$, (6) $CH_3-COOH$. If arranged in decreasing order of acidic strength, what is the position (1st, 2nd, etc.) of $Cl_3C-COOH$?

Prashant Kotian · Accepted Answer

Correct answer: 2. According to the DNP (Distance, Number, Power) rule: Distance is tied for all. Next, evaluate Number: (both have 3 groups, by power). Then (2 groups). Then 1 group: . The correct decreasing sequence is . Therefore, is exactly in the 2nd position.

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