Question

Benedict's solution and Fehling's solution are similar in which of the following options:

• A. Both consist of a solution of $aq.CuS{O}_4$
• B. Both contain $NaOH$ and complexing reagent.
• C. Both contain $C{u}^{2+}$ ion as the oxidising agent.
• D. All of the above

Answer 1

The correct option is D All of the above

Fehling's solution and Benedict's solution are variants of essentially the same thing in the following.
General reaction of Benedict's test:
$RCHO+Cu(citrate{)}_2^{2-}+5O{H}^{-}\to RCO{O}^{-}+C{u}_{2}O\downarrow +3H_{2}O\text{Aldehyde}\text{Fehling's solution}\text{Carboxylate ion}\text{Brick Red ppt}$
General reaction of Fehling's test::
$RCHO+2C{u}^{2+}+5O{H}^{-}\to RCO{O}^{-}+C{u}_{2}O\downarrow +3H_{2}O\text{Aldehyde}\text{Fehling's solution}\text{Carboxylate ion}\text{Red-brown ppt}$
Both contain $C{u}^{2+}$ ion as the oxidizing agent.
Both contain NaOH and complexing reagent.
Both consist of a solution of $aq.CuS{O}_4$.
Thus option (d) is correct.