Back Bond and lewis acid

Question 1

Compare Lewis Acidic Nature
i)BF3,BCl3,BBr3,BI3
ii)BeF2,BeCl2,BeBr2,BeI2

Answer 1

i) BF3<BCl3<BBr3<BI3
ii)BeF2<BeCl2<BeBr2<BeI2

Question 2

Compare Lewis Acidic Nature

i)AlCl3,AlBr3,AlI3
ii)PF5,PCl5
iii)SiF4,SiCl4,SiBr4
iv)BF3,B(OH)3,B(NH2)3

Answer 2

i)AlCl3>AlBr3>AlI3
ii)PF5>PCl5
iii)SiF4>SiCk4>SiBr4
iv)BF3>B(OH)3>B(NH2)3

Question 3

Compare lewis basic nature:
i)NH3,PH3,AsH3,SbH3
ii)H2O,H2S,H2Se,H2Te
iii)F -,Cl -,Br -,I -

Answer 3

i)NH3>PH3>AsH3>SbH3
ii)H2O>H2S>H2Se>H2Te
iii)F ->Cl ->Br ->I -

Question 4

Compare lewis basic nature of

i)CH3 -,NH2 -,OH -,F -
ii)PH3,H2S,HCl
iii)NF3,NCl3,NBr3,NI3

Answer 4

i)CH3 ->NH2 ->OH ->F -
ii)PH3>H2S>HCl
iii)NF3<NCl3<NBr3<NI3

Question 5

Compare H+ donor ability
i)HCF3,HCCl3
ii)CH3OH,SiH3OH

Answer 5

i)HCF3<HCCl3
ii)CH3OH<SiH3OH

Question 6

Compare B-F Bond Length:
i)BF3,BF2H,BFH2
ii)BF3,BF2Cl,BFCl2
iii)BF3,BF2OH,BF2NH2

Answer 6

i)BF3>BF2H>BFH2
ii)BF3>BF2Cl>BFCl2
iii)BF3<BF2OH<BF2NH2