Question

the correct sequence of increasing covalent character is represented by a) LiCl, NaCl, BeCl2 b) nacl, licl, becl2 c) BECL2, LICL ,NAcl d) becl2 nacl licl

Answer 1

correct answer ìs c option

Answer 2

Answer: Option (c) is the correct answer.

Explanation:

Covalent bond is formed by sharing of electrons. Therefore, more is the sharing of electrons more will be the covalent character.

The atomic number of beryllium is 4 and atomic number of chlorine is 7, therefore, beryllium will donate one electron each to chlorine atoms. Since beryllium is smaller in size so electrons will be closer to the nucleus. As a result, there will be difficulty in transfer of electrons from beryllium to chlorine.

Thus, there will be sharing of 2 electrons.

Lithium and sodium belongs to the same group. According to Fajan's rule, small size cation when combines with larger anion then it results in the formation of a covalent bond. Therefore, LiCl will be more covalent as compared to NaCl.

Thus, we can conclude that the correct sequence of increasing covalent character is $BeCl_{2}, LiCl, NaCl$.