Q59. Total number of species from the following with central atom utilising $\mathrm { sp } ^ { 2 }$ hybrid orbitals for bonding is\\
$\_\_\_\_$ . $\mathrm { NH } _ { 3 } , \mathrm { SO } _ { 2 } , \mathrm { SiO } _ { 2 } , \mathrm { BeCl } _ { 2 } , \mathrm { C } _ { 2 } \mathrm { H } _ { 2 } , \mathrm { C } _ { 2 } \mathrm { H } _ { 4 } , \mathrm { BCl } _ { 3 } , \mathrm { HCHO } , \mathrm { C } _ { 6 } \mathrm { H } _ { 6 } , \mathrm { BF } _ { 3 } , \mathrm { C } _ { 2 } \mathrm { H } _ { 4 } \mathrm { Cl } _ { 2 }$
Q60.\\
\includegraphics[max width=\textwidth, alt={}, center]{0b8a1bc0-351f-46d1-9f54-c9f2aa997d2e-11_287_983_1804_219}
The ratio of number of oxygen atoms to bromine atoms in the product $Q$ is $\_\_\_\_$ $\times 10 ^ { - 1 }$.