Question

In which of the following dative bonds is not present?
A. ${H_3}{O^ + }$
B. $N{H_4}^ +$
C. $A{l_2}C{l_6}$
D. ${N_2}{H_6}$

Answer 1

To get the correct answer of this problem first of all we need to know about dative bonds . Another name of dative bond is co- ordinate bond. It is a covalent bond (A kind of bond where a shared pair of electrons takes place) in which the electrons come from the same atom.

Complete step by step answer:
There are certain important points which are helpful in the identification of dative bonds. One point is that this bond is a lone pair in one atom and an empty orbital in the other atom. In dative covalent bonding the principle of sharing electrons between two atoms but in dative bonding the electrons involved in bonding are donated by the same atom. Let’s draw the structure of the given compounds and ions to check whether they have dative bonds or not. The structures of all four options are as follows.

In the above structure we can see that among the hydronium ion /${H_3}{O^ + }$ , ammonium ion / $N{H_4}^ +$ , aluminium chloride / $A{l_2}C{l_6}$ and hydrazine / ${N_2}{H_6}$, only hydrazine do not have dative bond. So, the correct answer is “Option D”.

Note: Hence we need to draw the chemical structure of substance in order to get the dative bonding. Here in this question we have tried to complete the octet of atoms in the compounds by giving them correct electrons and then we get that only hydrazine does not have dative bonding. Other compounds have dative bonding in their structure and it is represented by arrow signs.