MCQ
Identify A and B in the given chemical reaction sequence : -


- A

- B

- C

- D






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(atomic number : $\mathrm{Xe}=54, \mathrm{Ce}=58, \mathrm{Eu}=63$ )
(Given : $\left.pK _{ a }\left( CH _{3} COOH \right)=4.76\right)$
$\log 2=0.30$ $\log 3=0.48$ $\log 5=0.69$ $\log 7=0.84$ $\log 11=1.04$