Explain why: (i) the dipole moment of chlorobenzene is lower than that of cyclohexyl chloride? (ii) alkyl halides though polar. are immiscible with water? (iii) Gringard reagents should be prepared under anhydrous conditions?

Explain why: (i) the dipole moment of chlorobenzene is lower than tha

1.	Explain why: (i) the dipole moment of chlorobenzene is lower than that of cyclohexyl chloride? (ii) alkyl halides though polar. are immiscible with water? (iii) Gringard reagents should be prepared under anhydrous conditions?
Answer» Solution :(i) CHLOROBENZENE is stabilised by resonance and there is NEGATIVE charge on .Cl. in 3 out of 5 resonating structures, therefore it has a lower dipolec moment than cyclohexyl chloride in which there is no such negative charge. (ii) ALKYL halides cannot form H-bond with water and cannot break H-bonds between water molecules, therefore they are INSOLUBLE in water. (iii) Grignard reagents react with `H_2O` to form alkanes, therefore they are preparcd under anhydrous conditions.