AP EAPCET (Engineering) Hydrocarbons — practice questions
102 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice AP EAPCET (Engineering) Hydrocarbons in the app →Hydrocarbons are organic compounds composed exclusively of:In the presence of organic peroxides, addition of HBr to propene gives predominantly:Wurtz reaction is used to prepare:LPG, a common domestic fuel, stands for:Coal gas is obtained from coal by:Saturated hydrocarbons whose carbon atoms form a ring are called:Methane occurs naturally in:General formula of the alkane homologous series is:Each H-C-H bond angle in methane is:In alkanes, the C-C bond length is about:How many chain isomers does C5H12 have?How many structural isomers are possible for hexane, C6H14?About how many isomers are possible for C10H22?Isomers that differ only in their carbon skeleton are:A carbon atom bonded to four other carbon atoms is:The end carbon atoms of an open alkane chain are always:2,2-Dimethylpropane is commonly called:Groups formed by removing one hydrogen from an alkane are:Which alkyl halides are not reduced to alkanes by Zn and dilute HCl?Wurtz coupling of one alkyl halide gives alkanes with:Soda lime is a mixture of:Heating sodium propanoate with soda lime gives:Kolbe electrolysis of aqueous sodium acetate produces:Petrol removes grease stains because grease is:Boiling points of alkanes rise with molecular mass because:More branching lowers an alkane's boiling point because molecules become:Chlorination of methane in diffused sunlight is a:Order of reactivity of halogens with alkanes is:Free radical halogenation has initiation, propagation and:Chlorination of methane begins with homolysis of Cl2 because:Ethane forms as a by-product in chlorination of methane because:n-Alkanes heated with anhydrous AlCl3 and HCl gas undergo:n-Hexane over Cr2O3 on alumina at 773 K forms benzene. This is:Which n-alkane gives toluene on aromatisation?Breaking higher alkanes into smaller molecules by heat is:Arrangements interconverted by rotation about a C-C single bond are:Energy difference between staggered and eclipsed ethane is about:In which projection is the rear carbon drawn as a circle?Alkenes are called olefins, a name meaning:The pi bond of C=C is weaker than its sigma bond because of:Bond enthalpy of the C≡C bond in ethyne is about:Loosely held pi electrons make alkenes react mainly with:Methene is short lived. The first stable alkene is:But-1-ene and but-2-ene are an example of:Cis-trans isomerism in alkenes arises because:In a cis alkene, the two identical groups lie:trans-But-2-ene has nearly zero dipole moment because:Compared with the cis isomer, a solid trans alkene usually has:Partial hydrogenation of an alkyne over Lindlar's catalyst gives:Reducing an alkyne with sodium in liquid ammonia gives:For dehydrohalogenation with alcoholic KOH, the halogen order is:Dihalides with halogens on adjacent carbon atoms are called:Vicinal dihalides heated with zinc metal give:Alcohols heated with concentrated H2SO4 form alkenes by:Ethene is a colourless gas with:Reactivity of hydrogen halides towards alkenes follows:By Markovnikov's rule, the negative part of the adding molecule goes to the carbon with:Propene with HBr and no peroxide gives mainly:Anti-Markovnikov addition of HBr with peroxide is called the:The peroxide effect does not occur with HCl because:Propene with water and a little concentrated H2SO4 gives mainly:In ozonolysis, the ozonide is cleaved using:Ozonolysis of but-2-ene gives:Polythene is made by polymerising:Milk crates and plastic buckets are commonly moulded from:Which hydrocarbon is burnt with oxygen in welding torches?How many pi bonds are present in one ethyne molecule?Industrially, ethyne is made by treating calcium carbide with:Ethyne is more acidic than ethene because its carbon orbitals have:Which compound does not react with sodamide to give a salt?Ethyne reacts with sodium metal to give sodium acetylide and:Propyne with dilute H2SO4 and HgSO4 gives mainly:Which polymer made from ethyne can conduct electricity?Aromatic compounds that lack a benzene ring are called:How many position isomers does dibromobenzene have?In a disubstituted benzene, the 1,2 relationship is called:Benzene was first isolated in 1825 by:Kekule's fixed structure predicted how many 1,2-dibromobenzenes?A planar cyclic conjugated ring is aromatic if its pi electron count is:Every C-C bond length in benzene is about:X-ray diffraction shows that the benzene molecule is:Commercially, benzene is obtained from:Which aromatic hydrocarbon is used in moth repellent balls?The characteristic reactions of arenes are:The nitrating mixture for benzene is concentrated HNO3 with:The electrophile in the nitration of benzene is the:Friedel-Crafts alkylation of benzene uses an alkyl halide and:Benzene with hydrogen over nickel at high temperature gives:When burnt in air, benzene gives a:The carbocation intermediate in electrophilic substitution of benzene is the:The arenium ion is not aromatic because:In chlorobenzene, the chlorine atom is:Polynuclear hydrocarbons from burning tobacco are harmful because they are:Bond angles around each carbon of an alkene double bond are about:Which organic compound is produced on the largest scale industrially?Which of these groups contains a carbon-carbon double bond?Industrial epoxidation of ethylene with oxygen uses a catalyst based on:When irradiated with UV light, alkenes dimerise to give:The general formula of open-chain alkynes with one triple bond is:Small cyclic alkynes are rare mainly because:Excess bromine adds to an alkyne to finally give a:In naming an alkyne, the parent chain must: