Mehlala ea Lipotso Tse Buisanang ka Lihlopha tse Sebetsang e le Litsi tse Sebetsang Metsoakong ea Lintho tse Hloahloa
Sehlopha se sebetsang ke sehlopha se itseng sa liathomo ka har'a molek'hule se khethollang litšobotsi tsa karabelo ea lik'hemik'hale. K'hemistri ea lintho tse phelang, lihlopha tse sebetsang li sebetsa e le libaka tse sebetsang, ke hore, libaka tseo lik'hemik'hale li etsahalang ho tsona. Sengoloa sena se tla tšohla mehlala ea mathata a amang lihlopha tse sebetsang e le libaka tse sebetsang metsoakong ea lintho tse phelang le ho fana ka kutloisiso e tebileng ea hore na lihlopha tse sebetsang li ama karabelo le thepa ea lik'hemik'hale ea metsoako ena joang.
Ho Utloisisa Lihlopha tse Sebetsang
Lihlopha tse sebetsang ke metsoako e itseng ea liathomo ka har'a limolek'hule tse ikarabellang ka linako tsohle bakeng sa mekhoa e itseng ea lik'hemik'hale. Mehlala e tloaelehileng e kenyelletsa hydroxyl (-OH) ka har'a alcohols, carbonyl (C=O) ka har'a aldehydes le ketones, carboxyl (-COOH) ka har'a li-carboxylic acid, amino (-NH2) ka har'a li-amine, le halides (-X) joalo ka -Cl, -Br, kapa -I ka har'a li-haloalkanes.
Karolo ea Lihlopha tse Sebetsang e le Litsi tse Sebetsang
Moelelong oa lik'hemik'hale tsa tlhaho, lihlopha tse sebetsang li sebetsa e le libaka tse arabelang ka ho fetisisa limolek'huleng ka lebaka la bongata ba lielektrone kapa maemo a ikhethang a matla. Li susumetsa karabelo ea limolek'hule, li khetholla mefuta ea likarabo tse ka bang teng kapa tse ke keng tsa etsahala.
Lipotso tsa Mehlala le Puisano
A re shebeng mehlala e meng ea lipotso tse amanang le lihlopha tse sebetsang e le litsi tse sebetsang metsoakong ea lintho tse phelang.
Potso ea 1
Fana ka lebitso 'me u bontše sehlopha se sebetsang sa motsoako o latelang: CH3CH2OH.
Puisano:
Motswako wa CH3CH2OH ke ethanol. Sehlopha se sebetsang mona ke hydroxyl (-OH). Sehlopha sa hydroxyl se fumaneha athomong ya bobedi ya carbon ka hara ketane ya dikhabone tse pedi, e leng se etsang hore ethanol e be jwala ya mantlha.
Potso ea 2
Hlalosa setsi se sebetsang motswakong o latelang: CH3COCH3.
Puisano:
Motswako CH3COCH3 ke propanone, e tsejoang hape e le acetone. Sehlopha se sebetsang ka har'a motsoako ona ke carbonyl (C=O). Sehlopha sa carbonyl se etsa hore motsoako ona e be ketone. Sebaka se sebetsang se fumaneha holim'a athomo ea carbonyl carbon hobane oksijene e ntša lielektrone ka har'a carbon, e leng se etsang hore carbon e be e electrophilic haholoanyane 'me e be kotsing ea tlhaselo ea nucleophilic.
Potso ea 3
Ngola karabelo pakeng tsa asiti ea acetic (CH3COOH) le ethanol (CH3CH2OH). Hlalosa lihlopha tse sebetsang tse amehang le lihlahisoa tse entsoeng.
Puisano:
Karabelo pakeng tsa asiti ea acetic le ethanol ke mohlala oa karabelo ea esterification, e hlahisang ester le metsi.
Karabelo e ka ngolwa tjena:
\[ \text{CH}_3\text{COOH} + \text{CH}_3\text{CH}_2\text{OH} \rightarrow \text{CH}_3\text{COOCH}_2\text{CH}_3 + \text{H}_2\text{O} \]
Lihlopha tse sebetsang tse amehang karabelong ena ke carboxyl (-COOH) ka har'a asiti ea acetic le hydroxyl (-OH) ka har'a ethanol. Lihlahisoa tse hlahisoang ke ethyl acetate (CH3COOCH2CH3) e le ester le metsi (H2O).
Reactivity le Catalysis
Liketsahalong tse ngata tsa lik'hemik'hale tsa tlhaho, li-catalyst hangata li sebelisoa ho eketsa sekhahla sa karabelo. Mohlala, sulfuric acid (H2SO4) hangata e sebelisoa e le catalyst liketsong tsa esterification ho potlakisa ho thehoa ha li-ester. Sehlopha sa ts'ebetso ea carboxyl ka har'a acetic acid se arabela le sehlopha sa hydroxyl ka har'a ethanol tikolohong e nang le asiti, 'me se etsa ester le metsi.
Lipotso tsa Mehlala e Tsoetseng Pele
A re hlahlobeng lipotso tse ling tse eketsehileng ho tebisa kutloisiso ea rona ea hore na lihlopha tse sebetsang li sebetsa joang e le litsi tse sebetsang liketsong tse fapaneng tsa lik'hemik'hale.
Potso ea 4
Hlalosa phapang ea lik'hemik'hale tse ka hlahang ho alcohols tsa mantlha, alcohols tsa bobeli, le alcohols tsa boraro tse nang le li-reagent tse oxidizing tse kang potassium permanganate (KMnO4).
Puisano:
Ho arabela ha alcohols ho di-reagent tse oxidizing tse kang KMnO4 ho itshetlehile haholo ka mofuta wa jwala.
1. Joala ba Pele (RCH2OH): Joala ba pele bo tla oxidized ke KMnO4 ho ba asiti ea carboxylic.
– Mohlala: Ethanol (CH3CH2OH) e tla oxidized ho ba acetic acid (CH3COOH).
2. Joala ba Bobeli (R2CHOH): Joala ba bobeli bo tla oxidized ho ba ketone.
– Mohlala: Isopropanol (CH3CH(OH)CH3) e tla oxidized ho ba acetone (CH3COCH3).
3. Dino tse Tala tsa Tertiary (R3COH): Dino tse Tala tsa Tertiary hangata ha di qhibilihiswe ke KMnO4 ka lebaka la kgaello ya haeterojene e hokahaneng ka ho toba le khabone e amanang le sehlopha sa hydroxyl.
– Mohlala: Tert-butanol ((CH3)3COH) hangata e hanela oxidation ke KMnO4.
Potso ea 5
Hlalosa mokhoa oa karabelo ea lik'hemik'hale bakeng sa ho eketsa HBr ho propene (CH3CH=CH2). Bolela sehlahisoa se seholo 'me u khetholle lihlopha tse sebetsang tse teng sehlahisoa sa ho qetela.
Puisano:
Karabelo ea tlatsetso ea HBr ho propene ke karabelo ea tlatsetso ea electrophilic e latelang puso ea Markovnikov, moo haedrojene e tsoang ho HBr e tla eketsa athomong ea khabone e nang le palo e kholo ea litlamo tsa haedrojene.
Mokhoa oa karabelo:
1. Sebopeho sa khabohaedreite:
\[ \text{CH}_3\text{CH=CH}_2 + \text{HBr} \rightarrow \text{CH}_3\text{CH}^+\text{CH}_3 + \text{Br}^- \]
2. Tlhaselo ea nucleophilic ke ione ea bromide:
\[ \text{CH}_3\text{CH}^+\text{CH}_3 + \text{Br}^- \rightarrow \text{CH}_3\text{CH}\text{BrCH}_3 \]
Sehlahisoa se seholo ke 2-bromopropane (CH3CHBrCH3). Lihlopha tse sebetsang tse teng sehlahisoa sa ho qetela ke sehlopha sa alkyl le sehlopha sa halide (bromo-Br).
Qetello
Lihlopha tse sebetsang ke likarolo tsa bohlokoa tsa k'hemistri ea lintho tse phelang hobane li fumana hore na metsoako e sebetsa joang le hore na metsoako e sebetsa joang. Ka kutloisiso e nepahetseng ea lihlopha tse sebetsang, re ka bolela esale pele hore na metsoako ea lintho tse phelang e tla itšoara joang tlas'a maemo a itseng. Puisano ea mathata a ka holimo e bontša kamoo lihlopha tse sebetsang li sebetsang kateng e le libaka tse sebetsang liketsong tse fapaneng tsa lik'hemik'hale, ho tloha ho oxidation le phokotso ho ea ho eketsa le ho etsa esterification. Kutloisiso ena e ntlafalitsoeng e bohlokoa bakeng sa lits'ebetso tse fapaneng tse sebetsang k'hemistri, biochemistry le indastering ea meriana.
