MCQ
How many $2^o$ Hydrogen atoms are present in the given following compound?


- A$2$
- B$5$
- ✓$7$
- D$8$


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$(A)$ The acidity of compound $I$ is due to delocalization in the conjugate base.
$(B)$ The conjugate base of compound IV is aromatic.
$(C)$ Compound II becomes more acidic, when it has a $- NO _2$ substituent.
$(D)$ The acidity of compounds follows the order $I > IV > V > II > III$.
$C{H_3}C{H_2}COOH\xrightarrow{{PC{l_3}}}I\xrightarrow[{AlC{l_3}}]{{{C_6}{H_6}}}II\xrightarrow[{base,heat}]{{N{H_2}N{H_2}}}III$ is