The correct order of their reactivity towards hydrolysis at room temperature is:

1. $\left(\mathrm{A}\right)>\left(\mathrm{B}\right)>\left(\mathrm{C}\right)>\left(\mathrm{D}\right)$
2. $\left(\mathrm{D}\right)>\left(\mathrm{A}\right)>\left(\mathrm{B}\right)>\left(\mathrm{C}\right)$
3. $\left(\mathrm{D}\right)>\left(\mathrm{B}\right)>\left(\mathrm{A}\right)>\left(\mathrm{C}\right)$
4. $\left(\mathrm{A}\right)>\left(\mathrm{C}\right)>\left(\mathrm{B}\right)>\left(\mathrm{D}\right)$

Solution

$+\mathrm{M}$  group attached with carbonyl bond will decrease reactivity of acid derivative towards hydrolysis. For halogen $-\mathrm{I}$ dominate over $+\mathrm{M}$ therefore, acid chloride is most reactive. As extent of $+\mathrm{M}$ effect increases, reactivity decreases. Overall, order of reactivity is:

Asked in: JEE Main 2021 (20 Jul Shift 2)

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