Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 General Science Chemistry Organic Chemistry

Samples of benzaldehyde and acetaldehyde can be distinguished by using 

1
2,4 Dinitrophenylhydrazine 
2
Tollen's reagent 
3
Mixture of Fehling solution A + B 
4
Zn-Hg/HCl 
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