Chemistry of HydrocarbonsPreparation of Alkynes by Double Dehydrohalogenation31Choose the best answerAlkynes are commonly prepared by double dehydrohalogenation of:AGeminal or vicinal dihalidesBAlcohols onlyCAldehydes onlyDCarboxylic acids Like 0 Discuss 0Share
Sindh MDCAT 2022 Chemistry#Chemistry of Hydrocarbons#Wurtz Reaction32Choose the best answerQ.81 2-chloropropane is heated with Na metal, product is 2,3-dimethylbutane. Reaction is:ADehydrohalogenationBWurtz reactionCDehydrationDCatalytic dehydrogenation Like 0 Discuss 0Share
Chemistry of HydrocarbonsFree-Radical Halogenation of Alkanes33Choose the best answerFree-radical substitution of an alkane with chlorine is initiated by:AHeat or UV lightBDilute HClCConcentrated H₂SO₄DKMnO₄ Like 0 Discuss 0Share
Chemistry of HydrocarbonsActivating and Deactivating Groups34Choose the best answerThe correct order of ring activation toward electrophilic substitution is:AAniline > Phenol > BenzeneBBenzene > Phenol > AnilineCPhenol > Benzene > AnilineDBenzene > Aniline > Phenol Like 0 Discuss 0Share
MDCAT Chemistry Past Papers Reconduct 2023#Chemistry of Hydrocarbons#Cracking35Choose the best answerCracking is a process used to increase the quantity of petrol (gasoline) from which source? (MDCAT Reconduct 2023)ACrude oilBCoalCBiomassDNatural gas Like 0 Discuss 0Share