MCQ
Which of the following cannot act as Nucleophile?
- A$NH_3$
- B$\mathop O\limits^\Theta H$
- ✓$: CCl_2$
- D$\mathop C\limits^\Theta N$

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$D$-Erythrose and its isomers are listed as $P , Q , R$, and $S$ in Column-$I$. Choose the correct relationship of $P , Q , R$, and $S$ with D-erythrose from Column $II$.
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$(A)$ Graphite is harder than diamond.
$(B)$ Graphite has higher electrical conductivity than diamond
$(C)$ Graphite has higher thermal conductivity than diamond
$(D)$ Graphite has higher $C$ - $C$ bond order than diamond

Which one of the following options represents identical molecules?