MCQ
Which of the following is least basic?
- A$\left( CH _{3} CO \right) \ddot{ N } HC _{2} H _{5}$
- B$\left( C _{2} H _{5}\right)_{3} \ddot{ N }$
- ✓$\left( CH _{3} CO \right)_{2} \ddot{ N}H$
- D$\left( C _{2} H _{5}\right)_{2} \ddot{ N }H$

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Reason : Hydrogen is present above $Cu$ in the reactivity series.
$C{H_3}CHO\mathop {\xrightarrow{{(i)\,NaCN/HCl}}}\limits_{(ii)\,{H_2}O/{H^ \oplus }/\Delta } (A)\mathop {\xrightarrow{{Fenton}}}\limits_{reagent} (B)$
$(B)$ will be :