Out of KCl, HCl, CCl₄ and NaCl, the compounds which are not ionic are:

54 The atomic number of an element X is 16. The symbol of ion formed by an atom of this element will be : 55 The number of protons in the nucleus of one atom of an element Y is 5. The symbol of ion formed by an atom of this element will be: 57 Element X reacts with element Y to form a compound Z. During the formation of compound Z, atoms of X lose one electron each whereas atoms of Y gain one electron each. Which of the following property is not shown by compound Z? 58 One of the following compounds is not ionic in nature. This compound is: