Among LiCl, BeCl₂, BCl₃ and CCl₄,
the covalent bond character varies as:

1. LiCl < BeCl₂ > BCl₃ > CCl₄
2. LiCl > BeCl₂ < BCl₃ < CCl₄
3. LiCl < BeCl₂ < BCl₃ < CCl₄
4. LiCl > BeCl₂ > BCl₃ > CCl₄

Which of the following is the most basic oxide?

1. $A{l}_2{O}_3$

2. $S{b}_2{O}_3$

3. $B{i}_2{O}_3$

4. $Se{O}_2$