- APresence of acidic group
- BPresence of alkaline group
- CPresence of ketonic group
- ✓Presence of aldehyde group
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$\mathrm{C}-\mathrm{Cl}, \mathrm{C}-\mathrm{Br}, \mathrm{C}-\mathrm{F}, \mathrm{C}-\mathrm{I}$

The above reaction is of zero order. Half life of this reaction is $50\,min$. The time taken for the concentration of $A$ to reduce to one-fourth of its initial value is $...........\min$(Nearest integer)
[Atomic numbers of $Cr =24$ and $Mn =25$ ]
$(A)$ $Cr ^{2+}$ is a reducing agent
$(B)$ $Mn ^{3+}$ is an oxidizing agent
$(C)$ Both $Cr ^{2+}$ and $Mn ^{3+}$ exhibit $d^4$ electronic configuration
$(D)$ When $Cr ^{2+}$ is used as a reducing agent, the chromium ion attains $d^5$ electronic configuration
$R =0.083\, L$ bar $K ^{-1} \,mol ^{-1}$ ) (Nearest integer)