Q.

Number of lone pairs on bonded atoms in PCl3 molecule is ‘X’. Number of lone pairs on central atom of PCl3 molecule is ‘Y’. Difference between X and Y is

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a

8

b

2

c

0

d

12

answer is A.

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Detailed Solution

Number of electron pairs(EP)=V+M-C+A2; V=Group number of central atom; M=-H, -X, -OH....monovalent groups attached to central atom ; C=Charge of cation ; A=Charge of anion ; V=2,3,4,5,6,7,8 respectively for 2nd , 13th, 14th,15th, 16th,  17th, 18th group elements ; Number bond pairs, BP(according to VSEPR theory)=Number of atoms directly attached to central atom;                                                                                                   =4,3,2 respectively in CH4(CX4), NH3( PX3 ), H2O ; Number lone pairs on central atom(LP)=EP-BP ;                                                                           =0,1,2 respectively in  CH4(CX4), NH3 ( PX3 ), H2O ; NH3(NX3)....PX3,AsX3,SbX3,BiX3,-'3' bp +'1' lp  on central atom ; sp3-Pyramidal ; RX3---10   lone pairs/molecule--9   lone pairs on bonded atoms--R--15th group element ;
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Number of lone pairs on bonded atoms in PCl3 molecule is ‘X’. Number of lone pairs on central atom of PCl3 molecule is ‘Y’. Difference between X and Y is