Which of the following statements is incorrect regarding the reaction? aligned & CH_3 CHO+[Ag(NH_3)_2]^ +OH & CH_3 COO^ - +Ag & aligned

Correct answer: C. CH_3 CHO is an oxidising agent Oxidation: CH_3 CHO+3 OH^ - CH_3 COO^ - +2 e^ - +2 H_2 O ...(i) Reduction: \ [Ag(NH_3)_2]^ + +e^ Ag+2 NH_3\ × 2 ...(ii) aligned & CH_3 CHO+[Ag(NH_3)_2]^ +3 OH & CH_3 COO^ - +2 H_2 O+2 Ag+4 NH_3 & aligned Molecular mass of CH_3 CHO=44 Equivalent weight = M W n -factor =(44)/(2)=22 Therefore, acetaldehyde is not an oxidising agent.

JIPMER 2016

Exam: JIPMER
Year: 2016
Subject: Chemistry
Chapter: Coordination Compounds

JIPMER 2016 · Chemistry · Coordination Compounds

Which of the following statements is incorrect regarding the...

Which of the following statements is incorrect regarding the reaction?

\begin{aligned} & \mathrm{CH}_3 \mathrm{CHO}+\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{\oplus}+\mathrm{OH} \\ & \longrightarrow \mathrm{CH}_3 \mathrm{COO}^{-}+\mathrm{Ag} \\ & \end{aligned}

Options

AThe equivalent weight of $\mathrm{CH}_3 \mathrm{CHO}$ is 22
BThree moles of $\mathrm{OH}^{-}$ are required in the above reaction
C $\mathrm{CH}_3 \mathrm{CHO}$ is an oxidising agent
DReduction of $\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{\oplus}$ occurs

Correct answer

C. $\mathrm{CH}_3 \mathrm{CHO}$ is an oxidising agent

Step-by-step solution

Oxidation:

\mathrm{CH}_3 \mathrm{CHO}+3 \mathrm{OH}^{-} \longrightarrow \mathrm{CH}_3 \mathrm{COO}^{-}+2 \mathrm{e}^{-}+2 \mathrm{H}_2 \mathrm{O}

...(i) Reduction:

\left\{\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{+}+\mathrm{e}^{\ominus} \longrightarrow \mathrm{Ag}+2 \mathrm{NH}_3\right\} \times 2

...(ii)

\begin{aligned} & \therefore \mathrm{CH}_3 \mathrm{CHO}+\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{\oplus}+3 \mathrm{OH} \longrightarrow \\ & \mathrm{CH}_3 \mathrm{COO}^{-}+2 \mathrm{H}_2 \mathrm{O}+2 \mathrm{Ag}+4 \mathrm{NH}_3 \\ & \end{aligned}

Molecular mass of

\mathrm{CH}_3 \mathrm{CHO}=44

Equivalent weight

=\frac{M W}{n \text{-factor }}=\frac{44}{2}=22

Therefore, acetaldehyde is not an oxidising agent.

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