b (b) $\underset{\text{Ethyl}\,\,\text{amine}}{\mathop{{{C}_{2}}{{H}_{5}}N{{H}_{2}}}}\,\xrightarrow{HN{{O}_{2}}}\underset{\text{Ethyl}\,\,\text{alcohol}}{\mathop{{{C}_{2}}{{H}_{5}}OH}}\,\xrightarrow{PC{{l}_{5}}}{{C}_{2}}{{H}_{5}}Cl$ $\xrightarrow{N{{H}_{3}}}\underset{\text{Ethyl}\,\,\text{amine}}{\mathop{{{C}_{2}}{{H}_{5}}N{{H}_{2}}}}\,$
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$9.3 \mathrm{~g}$ of aniline is subjected to reaction with excess of acetic anhydride to prepare acetanilide. The mass of acetanilide produced if the reaction is _________$100 \%$ completed is $\times 10^{-1} \mathrm{~g}$. (Given molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{~N}: 14, \mathrm{O}: 16, \mathrm{C}$ : $12, \mathrm{H}: 1)$
Number of compounds from the following which cannot undergo Friedel-Crafts reactions is ............ toluene, nitrobenzene, xylene, cumene, anline, chlorobenzene, $m$-nitroaniline, $m$-dinitrobenzene