The number of lone pairs of electrons on central atom of `H_(2)O,SnCl_(2),PCl_(3)and XeF_(2)` respectively are:

Options

A. 2,1,1,3
B. 2,2,1,3
C. 3,1,1,2
D. 2,1,2,3

Answer

A

Explanation

O is in Group 16 . Last shell has 6 electrons . Two
are shared with H-atoms . No of lone
pairs on o = 2
Sn is in Group 14 . Last shell has 4 electrons . Two
are shared . No. of lone pairs on Sn = 1 .
P is in Group 15 . shell has 5 electrons . Three
are shared with Cl atoms . No of
lone pair on P = 1
Xe is in Group 18 . Last shell has 8 electrons. Two
are shared with two F atoms .
No . of lone pairs on Xe = 3