Which one of the following statements is not correct?
- AMoissan boron is amorphous
- BThe reaction between boron and concentrated $HNO_3$ gives $N_2O$
- CAmorphous boron on heating with oxygen forms $B_2O_3$
- DBoron is a non-conductor of electricity
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In polymeric $(BeCl_2)_n$,there are
Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile,$E^{+}$:
$(a)$ Chlorobenzene,$2,4-$dinitrochlorobenzene,$p-$nitrochlorobenzene
$(b)$ Toluene,$p-CH_3-C_6H_4-NO_2$,$p-O_2N-C_6H_4-NO_2$
$(a)$ Chlorobenzene,$2,4-$dinitrochlorobenzene,$p-$nitrochlorobenzene
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