Formaldehyde thiab acetaldehyde ob leeg muaj alpha hydrogen. Yog li, ob lub tebchaw yuav pom qhov zoo Fehling qhov kev sim. Qhov thib ob reagent yog ammoniacal silver nitrate, feem ntau hu ua Tollen's reagent. … Yog li, ob qho tib si muab aldehydes yuav pom qhov zoo Tollens test.
Qhov twg aldehyde tsis muab Fehling qhov kev sim?
Aldehydes xws li benzaldehyde, tsis muaj alpha hydrogens thiab tsis tuaj yeem tsim ib qho enolate thiab yog li tsis muab qhov kev ntsuam xyuas zoo nrog Fehling cov tshuaj uas yog piv rau qhov tsis muaj zog oxidizing tus neeg sawv cev dua li Tollen's reagent, raws li ib txwm muaj.
Puas formaldehyde react nrog Fehling's?
Formaldehyde ([C{{H}_{2}}O]) reacts nrog Fehling tov tsim anion ntawm formic acid.
Kev xeem Fehling yog dab tsi?
Fehling cov tshuaj tuaj yeem siv los paub qhov txawv aldehyde vs ketone ua haujlwm pab pawg. Lub compound yuav tsum tau kuaj yog ntxiv rau Fehling cov tshuaj thiab cov sib tov yog rhuab. Aldehydes yog oxidized, muab qhov txiaj ntsig zoo, tab sis ketones tsis hnov tsw, tshwj tsis yog lawv yog α-hydroxy ketones.
Vim li cas aldehydes muab Fehling qhov kev sim?
Siv Fehling's Test
Nws yog siv los txiav txim seb pawg carbonyl puas yog aldehyde lossis ketone. Aldehydes nyiam oxidized thiab muab qhov txiaj ntsig zoo. Ketones sib nrug ntawm alpha-hydroxy-ketones tsis hnov qab.
