Easy Practice — Set 2

Quick Recap — Key Compounds & Trends

• Boron: diborane ($B_2H_6$, banana bonds), $BF_3$ (Lewis acid), boric acid (weak, monobasic Lewis acid).
• Nitrogen family: $NH_3$ (pyramidal, basic), $HNO_3$ (strong oxidiser); N shows $-3,+3,+5$; N cannot form $NCl_5$ (no d-orbitals).
• Halogens: oxidising power $F_2>Cl_2>Br_2>I_2$; acidic strength of $HX$: HF $<$ HCl $<$ HBr $<$ HI; interhalogens (e.g. $ClF_3$, $ICl$) are very reactive.
• Noble gases: monatomic; $XeF_2$ (linear), $XeF_4$ (square planar), $XeF_6$, $XeO_3$.