Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Calculate the value of $\mathrm{Z}-(\mathrm{X}+\mathrm{Y})$. ${\underline{\mathrm{BF}}}_3,{\underline{\mathrm{AlCl}}}_3,{\underline{\mathrm{NF}}}_3,{\underline{\mathrm{CF}}}_4,{\underline{\mathrm{CO}}}_2,{\underline{\mathrm{SiF}}}_4,{\mathrm{H}}_2\underline{\mathrm{O}},{\underline{\mathrm{PCl}}}_5$

$\mathrm{X}=$ Number of species having underlined atom which have maximum covalency equal to their group number of long form of periodic table.

$\mathrm{Y}=$ Number of species having underlined atom whose covalency can increase on donation of lone pair.

$\mathrm{Z}=$ Number of species having underlined atom whose covalency can increase on acceptance of lone pair.