MCQ
The $IUPAC$ name of $CH_3 -CH = CH -COOH$ is
- ✓But $-2-$ ene $-1-$ oic acid
- BBut $-1-$ ene $-1-$ oic acid
- CBut $-2-$ ene $-1-$ carboxylic acid
- DPropene $-1-$ carboxylic acid
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$O ^{2-}, N ^{3-}, F ^{-}, Mg ^{2+}, Na ^{+}$ and $Al ^{3+}$ is

$A$ in the above reaction is: