MCQ
Phenolphthalein is obtained by heating phthalic anhydride with conc. ${H_2}S{O_4}$ and
- ABenzyl alcohol
- BBenzene
- ✓Phenol
- DBenzoic acid

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$( F , L , D , Y , I , Q , P$ are one letter codes for amino acids)
Choose the correct statement($s$) about the above process
$(A)$ $OH ^{-}$ions react with $N _2 H _4$ at the anode to form $N _2( g )$ and water, releasing 4 electrons to the anode.
$(B)$ At the cathode, $N _2 H _4$ breaks to $N _2( g )$ and nascent hydrogen released at the electrode reacts with oxygen to form water.
$(C)$ At the cathode, molecular oxygen gets converted to $OH ^{-}$.
$(D)$ Oxides of nitrogen are major by-products of the electrochemical process.