Question
Explain Gattermann reaction.

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Identify compounds A, B and C in the following sequence of reaction.
$C _6 H _5 NO _2 \stackrel{ Fe / HCl }{\longrightarrow} A \underset{273 K }{\stackrel{ HNO _2}{\longrightarrow}} B \stackrel{ C _6 H _5 OH }{\longrightarrow} C$
A copper electrode is dipped in 0.1 M copper sulphate solution at 25°C. Calculate the electrode potential of copper.
[Given: $E _{ Cu ^{2+} \mid Cu }^0$ = 0.34 V]
Gabriel phthalimide synthesis