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STD 12 - 8.2 Carboxylic acids and their derivative — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 8.2 Carboxylic acids and their derivative4 Marks
MCQ
The correct decreasing order for acidic strength is
  • A
    $NO_2CH_2COOH > FCH_2COOH >$ $ CNCH_2COOH > ClCH_2COOH$
  • B
     $FCH_2COOH > NCCH_2COOH >$  $NO_2CH_2COOH > ClCH_2COOH$
  • C
    $CNCH_2COOH > O_2NCH_2COOH >$  $FCH_2COOH > ClCH_2COOH$
  • ✓
    $NO_2CH_2COOH > NCCH_2COOH >$  $FCH_2COOH > ClCH_2COOH$
✓

Answer

Correct option: D.
$NO_2CH_2COOH > NCCH_2COOH >$  $FCH_2COOH > ClCH_2COOH$
d
Acid strength in this case varies directly with the electron withdrawing power of the groups attached to the $\alpha  - $ carbon of $CH_3COOH$. The order of electron withdrawing tendency is
$NO_2 > CN > F > Cl$

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