Formation of Nh4Cl from NH3 and HCl is a synthesis reaction.comment on the statement.
In a synthesis reaction two or more chemical species combine to form a more complex product.
A + B → AB
In this form, a synthesis reaction is easy to recognize because you have more reactants than products. Two or more reactants combine to make one larger compound.
One way to think of synthesis reactions is that they are the reverse of a decomposition reaction.
Here HCL and NH3 react to form NH4CL the reactants just combined to become a more complex product. Nothing more or less.