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        QUESTIONS   Question 1. Give the uses of freon 12, DDT, carbon tetrachloride and iodoform. Question 2. p-Dichlorobenzene has higher m.p. and lower solubility than those of o- and m-isomers. Discuss.

QUESTIONS Question 1:  Write the isomers of the compound having formula C4H9Br. Question 2:  Write the equations for the preparation of 1−iodobutane from (i) 1-butanol (ii) 1-chlorobutane (iii) but-1-ene Question 2:  How will you bring about the followin g conversions? (i) Ethanol to but-1-yne (ii) Ethane to bromoethene (iii) Propene to 1-nitropropane (iv) Toluene to benzyl alcohol (v) Propene to propyne (vi) Ethanol to ethyl fluoride (vii) Bromomethane to propanone (viii) But-1-ene to but-2-ene  (ix) 1-Chlorobutane to n-octane  (x) Benzene to biphenyl. Question 3:  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) Grignard reagents should be prepared under anhydrous conditions?

PRACTICE QUESTIONS Question  1. Write the structures of the following organic halogen compounds. (i) 2 -Chloro-3 -methylpentane (ii) p -Bromochlorobenzene (iii) 1 -Chloro-4-ethylcyclohexane (iv) 2 – (2 -Chlorophenyl) -1 -iodooctane (v) Perfluorobenzene (vi) 4 – tert – Butyl -3 -iodoheptane (vii) 1 – Bromo – 4 – sec – butyl – 2 – methylbenzene (viii) 1 ,4 – Dibromobut – 2 – ene Question  2. Which one of the following has the highest dipole moment? (i) CH2Cl2 (ii) CHCl3 (iii) CCl4 Question 3. A hydrocarbon C5H10 does not react with chlorine in dark but gives a single monochloro compound C5H9Cl in bright sunlight. Identify the hydrocarbon.

            PRACTICE QUESTIONS Question 10.1: Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl ( primary, secondary, tertiary ), vinyl or aryl halides : (i) (CH 3 ) 2 CHCH(Cl)CH 3 (ii) CH 3 CH 2 CH(CH 3 )CH(C 2 H 5 )Cl (iii) CH 3 CH 2 C(CH 3 ) 2 CH 2 I (iv) (CH 3 ) 3 CCH 2 CH(Br)C 6 H 5 (v) CH 3 CH(CH 3 )CH(Br)CH 3 (vi) CH 3 C(C 2 H 5 ) 2 CH 2 Br (vii) CH 3 C(Cl)(C 2 H 5 )CH 2 CH 3 (viii) CH 3 CH=C(Cl)CH 2 CH(CH 3 ) 2 (ix) CH 3 CH=CHC(Br)(CH 3 ) 2 (x) p-ClC 6 H 4 CH 2 CH(CH 3 ) 2 (xi) m-ClCH 2 C 6 H 4 CH 2 C(CH 3 ) 3 (xii) o-Br-C 6 H 4 CH(CH 3 )CH 2 CH Question 10.2:Give the IUPAC names of the following compounds: (i) CH3 CH(Cl) CH(Br) CH3 (ii) CH F2 CBr ClF (iii) Cl CH2 C ≡ C CH2 Br (iv) ( CCl 3) 3 CCl (v) CH3 C (p – Cl C6 H4 )2 CH(Br) CH3 (vi) (CH3 )3 C CH = C Cl C6 H4 I 

NATURE OF C-X BOND :  •  Halogens is more electronegative than carbons.  •  Carbon atom has partial positive charge •  The nature of C-X bond depends on both the nature of carbon in the aromatic ring and the halogen attached.  •  Florine has the highest electronegative element of halogens.  •  The halogens elements(17th group) are just one electron short of completing their nearest novel gas configurations.  •  Electronegativity increased across a period from left to right.      (F>Cl>Br>I)  •  The C-X bond in haloarenes is polarised as 'X' are more electronegative than carbon.  •  The only one sigma bond is formed between one carbon and one halogen.  •  The atomic size has increased Florine to down the period.  •  The C-X bond length in haloarenes increases from Florine(F) to Astetine(As) and bond dissociated strength decreases....

Question . Discuss the structure of Side chain halogen Compounds.  Question . How do you to identify aromatic compounds. Discuss. 

Question 1.  How to explain 1°, 2°, and 3° Alkile Halides. Give the examples.  Question 2.  Give the molecular structure of given below compounds: •  CH 3-CH=C=C=O •  CH2-Cl-CH2-CH=CH-OH

IUPAC NOMENCLATURE -  •   CH2=CH-CH3 •  CH3-CH2-CH2-CH=CH2-Br •    CH3-CH2-CH2-CH=CH-CH2-Cl •   CH2=CH-OH •   CH3-CH2-OH

IUPAC NOMENCLATURE -  •   CH3-CH2-CH-Br2 •   CH3-CH2-CH2-CH2Cl •   CH3-CH2-CH2-CH2-CH3 •   CH-F2-CH2-CH3 •   CH3-CH2-CH2-CH2-CH2-Br2

Question 1. How to explain halogens in details.  Question 2. Give the physical & chemical properties of halogens.  Question 3. What is the characteristics of halogens. Give their uses.  Question 4. Give some Reactions with halogenic compounds to other metallic compounds.  Question 5. Why we called halogen of 17th group in the periodic table.                             **************

Exercising Questions :  Question 1.  Give the structural formula of following compounds : a) CCl4 b) CH2Cl2 c)   CH3CH2OH d) CHCl3 e) CH3Br f) CH3CH3CH2-I g) C6H4Br2 h) C6H50H Question 2.  Give the IUPAC name of following compounds: a) CH2-Cl-CH2-CH-Cl-OH b) CH3-CH2-CH-Br-CH3 c) C6H6