Question

sweet friends plzz help me WHAT DO U MEAN BY COORDINATE BOND

Answer 1

Bond is actually a force of attraction that acquires suitable energy and binds in some potential between two atoms.

Now,
Coordinate bond is just a type of covalent bond (covalent bonds are formed when two atoms share their electrons to fulfill each other's octet and become completely stable.)

However, what a coordinate bond means is that instead of both the atoms sharing one electron each to form the bond , one of the two interacting atoms gives away both of it's electrons to build the bond (potential) , however this is only possible when the donor has two or more non-bonded electrons to actually donate them. A famous example can he given as for donating lone pairs !

Nitrogen bonded along with the three hydrogen atoms has still a lone pair of electrons left in it's outermost shell.

So suppose a Electron deficienct specie comes in the viscinity of NH3 then the nitrgoen will donate both of it's electrons to Cationic hydrogen in this example to form a coordinate (dative) bond and become a molecule also famously known as NH4+ (Ammonium ion)


Hope this helps you !