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प्रश्न
In Tollen's test for aldehyde, the overall number of electrons(s) transferred to the Tollen's reagent formula \[\ce{[Ag(NH3)2]+}\] per aldehyde group to form silver mirror is ______. (Round off to the nearest integer)
विकल्प
1
3
4
2
MCQ
रिक्त स्थान भरें
उत्तर
In Tollen's test for aldehyde, the overall number of electrons(s) transferred to the Tollen's reagent formula \[\ce{[Ag(NH3)2]+}\] per aldehyde group to form silver mirror is 2.
Explanation:
Two half reactions are
\[\ce{[Ag(NH3)3]+ + e- -> Ag + 2NH3}\]
\[\ce{RCHO + 3OH- -> RCO^-_2 + 2H2O + 2e-}\]
Overall reaction is
\[\ce{2[Ag(NH3)2]+ + RCHO + 3OH- -> 2Ag + RCO^-_2 + 4NH3 + 2H2O}\]
Therefore, for 1 mol \[\ce{R - CHO}\], 2 mol of \[\ce{[Ag(NH3)2]+}\] is reduced.
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