HYDROCARBONS_ANS

HYDROCARBONS_ANS - Hydrocarbons 91(I)1.(a) HC/ALA/P.1...

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Hydrocarbons HC/ALA/P.1 91(I)1.(a) Reagent : HBr ( 1/2 ) CH 3 CH=CH 2 H Br CH 3 CH CH 3 Br CH 3 CHCH 3 Br + (1 1/2 ) The hydrogen atom of acid attaches itself to the carbon atom that already holds the greater no. of hydrogen atoms. This is called Markownikoff’s rule. Reagent : organic peroxide RO–OR ( 1/2 ) H 2 C=CHCH 3 ROCH 2 CHCH 3 H 2 C=CHCH 3 ROCH 2 CH CH 2 CH CH 3 CH 3 CH 2 CH CH 3 RO OR RO n 2 RO ( 11/2 ) 91(II)7.(a) (i) Reddish brown bromine turns colourless. ( 1 ) The reaction is a free radical reaction. ( 1/2 ) Depending on the amount of bromine, variety of substitution products is obtained. CH 3 CH 2 CH 2 CH 2 CH 3 hv  → 2 Br CH 3 CH 2 CH 2 CH 2 CH 2 Br + CH 3 CH 2 CH 2 CH 2 CHBr 2 etc. ( 1 ) (ii) Purple KMnO 4 turns to brown suspension of MnO 2 . ( 1 ) KMnO 4 is reduced / alkene is oxidized ( 1/2 ) CH 3 CH=CH 2 - /OH KMnO 4 CH 3 CH–CH 2 + MnO 2 ( 1 ) OH OH 93(II)9.(b) CH 3 CH 2 CH=CH 2 H Br CH 3 CH 2 CHCH 3 CH 3 CH 2 CH 2 CH 2 Br Br CH 3 CH 2 CHCH 3 CH 3 CH 2 CH 2 CH 2 Br Br + (Major product) (minor product) + + C 2 H 5 CHCH 3 is a 2 ° carbocation which is more stable than CH 3 CH 2 CH 2 CH 2 which is a 1 °
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Hydrocarbons HC/ALA/P.2 carbocation. ( 1 )
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Hydrocarbons HC/ALA/P.3 94(I)3.(a) (ii) C H 3 C H C H CH 3 C H 3 C H C CH 3 H CH 3 CH 2 CH=CH 2 ( 3 ) F G E E Zn (2) O (1) 3 H 2 CO + CH 3 CH 2 CHO ( 1 ) (b) CH 3 CH Br CH 3 (i) ( 1 ) (ii) Mechanism : CH 2 CH 3 CH H Br CH 3 CHCH 3 Br CH 3 CHCH 3 Br + ( 1 ) Minor product is CH
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HYDROCARBONS_ANS - Hydrocarbons 91(I)1.(a) HC/ALA/P.1...

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