MCQ
The $IUPAC$ name of following compound is


- APropan-$1, 2, 3$ -Tri Carboxylic acid
- ✓$3$ -Carboxymethylpentane-$1, 5$ -dioicacid
- C$1, 2, 3$ -Pentanetrioic acid
- D$1, 2, 3$ -Tripropane carboxylic acid

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Codes: $ \quad P \quad Q \quad R \quad S$
Maleic anhydride can be prepared by :
$(I)$ $NO + Br_2 \rightleftharpoons NOBr_2 $ ........ Fast
$(II)$ $NOBr_2 + NO \rightarrow 2NOBr$ ......... Slow
The overall order of this reaction is
