Which of the following characteristic properties is NOT true for crystalline solid?

Time required for $$90 \%$$ completion of a first order reaction is '$$x$$' minute. Calculate the time required to complete $$99.9 \%$$ of the reaction at same temperature.

Identify '$$A$$' in the following reaction:

A $$\mathrm{\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{ether}^{LiAl{H_4}}}}$$ Ethanamine

Which of the following reagents is used in Gatterman-Koch formylation of arene?