Suggest a chemical test to distinguish between the following pairs: 1. Choroethane and chlorobenzene 2. Chlorobenzene and benzyl chloride 3. Chloroethane and bromoethane. 4 Chloroform and carbontetrachloride

							1)chlorobenzene is an aromatic compound i.e chlorine atom is attatched directly to the aromatic ring which is benzene ..n the formula is C6H5-CL.. but chloroethane is an aliphatic hydrocabon...the formula is CH3CH2CL

2) add agno3 to benzyl chloride. benzene chloride has chlorine attached to side chain, so precipitate will be formed . in the case of  chloro benzene no agcl precipitate will be formed as the chlorine benzene bond is strong due to resonance...
						

							If we subject benzyl chloride to NaOH followed by AgNO3..it reacts to give a white ppt..whereas chlorobenzene does not..hence can we instantly differentiate between chlorobenzene and benzylchloride
						

							If we heat ChCl3 with KOH and primary amine foul smell is produced due to the formation of "-NC" group. If same reaction  is done with CCl4 no such smell is produced.This is also known as carbylamine test and mainly used for distinguishing primary amine from secondary and tertiary.
						

							
We can react both if them with NaOH followed by hydrolysis. Chlorobenzene can convert to phenol. We can then add ferric chloride which will give violet colour.