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Can you recall ?, , Identify the functional group, , in the following compounds., i Cr i. CCLF,, (Benzyl bromide) (Freon - 12), iii. cl iv.Cl - CH = CCl,, Cl Cl (Westrosol), cl cl, cl, (Hexachlorobenzene), v. cL, cl cl, cl cl, cL, (Hexachlorocyclohexane), , , , , , The parent family of organic compounds, is hydrocarbon. Replacement of hydrogen, atom/s in aliphatic or aromatic hydrocarbons, by halogen atom/s results in the formation of, halogen derivatives of hydrocarbons., , In this chapter we will study halogen, , derivatives in a systematic way., , Internet my friend, Find out the, , of two thyroid hormones T3, (triiodothyronine) and T4 (thyroxine)., How do these help our body ?, , , , 10.1 Classification of halogen derivatives :, , Halogen derivatives of hydrocarbons are, classified mainly in two ways., , a. On the basis of hydrocarbon skeleton to, which halogen atom is bonded, the halogen, derivatives are classified as haloalkanes,, haloalkenes, haloalkynes and haloarenes., , CH, - CH, - X CH, = CH - X, (Haloalkane) (Haloalkene), HC=C-X x, (Haloalkyne), , (Haloarene), , b. On the basis of number of halogen atoms,, halogen derivatives are classified as mono,, di, tri or poly halogen compounds., , x, CH,- CH, -X Cy, , Monohalogen compounds, , CH,-CH-X CH,- CH,, ; 1) - CH,, , xX xX xX, Dihalogen compounds, x, CH, - CH - CH, x, xX xX XxX, x, Trihalogen compounds, , We will consider classification of mono, halogen derivatives in more detail., , 10.1.1, compounds :, , Classification of monohalogen, Monohalogen compounds are, further classified on the basis of position of, halogen atom and the type of hybridization of, , carbon to which halogen is attached., , a. Alkyl halides or haloalkanes : In alkyl, halides or haloalkanes the halogen atom is, bonded to sp’ hybridized carbon which is, a part of saturated carbon skeleton. Alkyl, halides may be primary, secondary or tertiary, depending on the substitution state of the, carbon to which halogen is attached : (Refer, to Std. XI Chemistry Textbook, section 14.3).