MCQ
Which statement is true for ferrocene?
- AAll $Fe-C$ are of equal length
- BIt has sandwich type structure
- CIt was the first discovered organometallic compound
- ✓All of these

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$(A)$ Micelle formation is an exothermic process.
$(B)$ Micelle formation is an endothermic process.
$(C)$ The entropy change is positive.
$(D)$ The entropy change is negative.
$(1)$ $\begin{matrix}
O \\
|| \\
{{C}_{6}}{{H}_{5}}-C-{{C}_{6}}{{H}_{5}} \\
\end{matrix}$
$(2)$ $C _{6} H _{5}- CHO$
$(3)$ $p - CH _{3}- C _{6} H _{4}- CHO$
$(4)$ $p - CH _{3} O - C _{6} H _{4}- CHO$