MCQ
(image) $CH_3CH_2CHO+PCl_5 \to (B)$, $(A)$ and $(B)$ are


- Agem-dihalides
- B$(A)$ gem-dihalide, $(B)$ Vic-dihalide
- CVic-dihalides
- ✓$(A)$ Vic-dihalide, $(B)$ gem-dihalide


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$FeCr _{2} O _{4}+ Na _{2} CO _{3}+ O _{2} \rightarrow A + Fe _{2} O _{3}+ CO _{2}$
$A + H ^{+} \rightarrow B + H _{2} O + Na ^{+}$
(At. nos. $Ce = 58, Sm = 62,$$ Eu = 63, Yb = 70$)
