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Solution


Q.

Identify the reagents used for the following conversion                         [2024]
1 A=LiAlH4, B=NaOH(aq), C=NH2-NH2/KOH, ethylene glycol  
2 A=DIBAL-H, B=NaOH(aq), C=NH2-NH2/KOH, ethylene glycol  
3 A=DIBAL-H, B=NaOH(alc), C=Zn/HCl  
4 A=LiAlH4, B=NaOH(alc), C=Zn/HCl  

Ans.

(3)

DIBAL-H is used for selective reduction of esters and nitriles to aldehydes at low temperature (around 78°C).