Which of the following order are correct ? (I) Acidity order : o-nitrobenzoic acid p-nitrobenzoic acid m-nitrobenzoic acid (II) Basicity order : NH 2 − EtO − OH − RCOO − Cl − (III) Heat

Question

Which of the following order are correct ?

(I) Acidity order : o-nitrobenzoic acid > p-nitrobenzoic acid > m-nitrobenzoic acid

(II) Basicity order : $NH_{2}^{-}$ > $EtO^{-}$ > $OH^{-}$ > $RCOO^{-}$ > $Cl^{-}$

(III) Heat of hydrogenation:

cis-2-butene > trans-2-butene

(IV) Ease of decarboxylation :

$= C_{6} H_{5} COCOOH =$ $=$

TestHub · Accepted Answer

I follows nitro withdrawal and the ortho effect. II follows the decreasing pK a ​ values of the conjugate acids: ammonia, ethanol, water, carboxylic acid and HCl . III is correct because cis-2-butene is less stable than trans-2-butene and releases more heat on hydrogenation. The structurally different acids in IV do not have equal decarboxylation behavior. Therefore I , II and III are correct.

Chemistry - GOC Question with Solution | TestHub

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