Preparatory Method for Sulphamide:
Sulphamide is typically prepared by reacting ammonia with sulfur trioxide. The reaction proceeds as follows:
2NH3 + SO3 → H2NSO2NH2
This reaction is carried out at low temperatures to prevent decomposition of the product.

Preparatory Method for Phosphonitrile Chloride:
Phosphonitrile chloride is prepared by reacting phosphorus trichloride with ammonia. The reaction can be represented as:
PCl3 + NH3 → PClN2Cl + 3HCl
The product is a yellow liquid that can be purified by fractional distillation.

Structure of Sulphamide:
Sulphamide has a molecular formula of H2NSO2NH2. It contains a central sulfur atom bonded to two amine groups and one oxygen atom. The molecule is planar and exhibits a trigonal pyramidal geometry around the sulfur atom.

Structure of Phosphonitrile Chloride:
Phosphonitrile chloride has a molecular formula of PClN2Cl. It consists of a central phosphorus atom bonded to two nitrogen atoms and two chlorine atoms. The molecule adopts a tetrahedral geometry around the phosphorus atom.
Overall, the preparatory methods and structures of sulphamide and phosphonitrile chloride provide insight into the synthesis and chemical properties of these important compounds in chemistry.