The solid form of ortho isomer melts way earlier than para isomer as latter has a higher melting point due to its symmetric geometry.

The circled C atom is sp³ hybridised and is attached directly to an aromatic ring, hence it is a benzylic carbon and compound is a 1o benzylic halide.

The size of Cl atom is smaller than size of Br atom as latter appears lower than Cl in halogen group. Hence, carbon-halogen bond length of C-Br must be bigger than that of C-Cl, i.e., 178pm, refore it must be 193pm.

Since iodine is more reactive, replacement of diazonium group to form iodobenzene does not require presence of a cuprous halide and is done simply by shaking diazonium salt with KI.

The compound is dihaloalkane with 2 chlorine atoms one same carbon atom, hence it is a gem dihalide.

The reagent in Finkelstein reaction is strictly sodium iodide which reacts with eir alkyl bromides or chlorides to exchange iodine with or halogen group to form alkyl iodides.

The prefix sym- is used for trihaloarenes with same halogen atom at alternate positions in benzene ring (1, 3, 5). The prefixes o-, m- and p- are used for dihaloarenes depending on relative positions of two identical halogen atoms on aromatic ring.

A monohaloarene is a compound in which halogen is directly attached to benzene ring. Side chain substituted aryl halides are also aromatic halogen compounds with halogen not directly attached to benzene ring.

Freons are chlorofluorocarbon compounds of methane and ethane. The compound CBr₂F₂ contains bromine, and hence is not a freon.

Although F atom is much more electronegative than Cl, very small size of F compared to Cl results in product of charge and distance, i.e., dipole moment, of CH₃F to be lower than that of CH₃Cl.