Benzaldehyde can be converted to benzyl alcohol in concentrated aqueous $NaOH$ solution using

Which is correct about vanillin?

Which of the following is a lachrymatory agent or tear gas?

The starting material is $2,3-\text{dimethylbut-2-ene}$. It undergoes ozonolysis followed by reduction with $Zn/H_2O$ to form product $A$. Product $A$ then reacts with $CH_3MgBr$ followed by hydrolysis to form product $B$. Identify product $B$.

In the given reaction :
$CH_3CHO$ $\xrightarrow[(i) \ NaCN/HCl]{(ii) \ H_2O/H^{\oplus}/\Delta} (A)$ $\xrightarrow[reagent]{Fenton} (B)$
$(B)$ will be :

The general order of reactivity of carbonyl compounds for nucleophilic addition reactions is