MCQ
Repeating unit of organosilicon polymers is
- A${\rlap{-} ({R_2}Si\rlap{-} )_n}$
- B${\rlap{-} ({R_2}Si-O_2\rlap{-} )_n}$
- ✓${\rlap{-} ({R_2}SiO\rlap{-} )_n}$
- DAll of these
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Assertion $(A)$ : The first ionization enthalpy of $3 d$ series elements is more than that of group $2$ metals
Reason $(R)$ : In $3d$ series of elements successive filling of d-orbitals takes place.
In the light of the above statements, choose the correct answer from the options given below :
Acetoacetic ester $\xrightarrow{NaOEt}$ $\xrightarrow{C{{H}_{3}}I}$ $\xrightarrow{NaOEt}$ $\xrightarrow{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br}$
