MCQ
In polyenes that contain differently substituted $(C=C)$ double bonds, it is possible to hydrogenate chemeselectively one $(C=C)$ double bond. Product is


- A

- ✓

- C

- D







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| Column $-I$ | Column $-II$ |
| (Atomic number) | (Position of element in Periodic table) |
| $(A)$ $Z = 37$ | $(P)$ $p-$ block |
| $(B)$ $Z = 42$ | $(Q)$ $f-$ block |
| $(C)$ $Z = 34$ | $(R)$ $d-$ block |
| $(D)$ $Z = 92$ | $(S)$ $s-$ block |