Q 1 :    

Identify the suitable reagent for the following conversion.                [2025]

 

• (i) ${\mathrm{NaBH}}_4$, (ii) ${\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O}$

   

• ${\mathrm{H}}_2/\mathrm{Pd}-{\mathrm{BaSO}}_4$

   

• (i) ${\mathrm{LiAlH}}_4$, (ii) ${\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O}$

   

• (i) $\mathrm{AlH}{\left(i\mathrm{Bu}\right)}_2$, (ii) ${\mathrm{H}}_2\mathrm{O}$

   

Q 2 :    

Identify the correct reagents, that would bring about the following transformation:          [2024]

 

• (i) ${\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}$           (ii) ${\mathrm{CrO}}_3$

   

• (i) ${\mathrm{BH}}_3$     (ii) ${\mathrm{H}}_2{\mathrm{O}}_2/\overline{\mathrm{O}}\mathrm{H}$ (iii) PCC

   

• (i) ${\mathrm{BH}}_3$     (ii) ${\mathrm{H}}_2{\mathrm{O}}_2/\overline{\mathrm{O}}\mathrm{H}$     (iii) alk. ${\mathrm{KMnO}}_4$     (iv) ${\mathrm{H}}_3{\mathrm{O}}^{+}$

   

• (i) ${\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}$    (ii) PCC

   

Q 3 :    

The following conversion is known as           [2023]

• Stephen reaction

   

• Gattermann–Koch reaction

   

• Etard reaction

   

• Rosenmund reaction

   

Q 4 :    

The intermediate compound X in the following chemical reaction is                 [2021]

Q 5 :    

Identify compound X in the following sequence of reactions.               [2020]