CHM102 The default category for questions shared in context 'CHM102'. Fill in the Blank (FBQs) FBQ1 The use of ______ as octane number enhancer is being curtailed for environmental reasons. Tetraethyl lead 1.0000000 0.0000000 0.0000000 FBQ2 In ______ , fuel having a lower octane number is much more useful than those having a higher octane number. diesel engine 1.0000000 0.0000000 FBQ3 Quality of diesel fuel is expressed in terms of a parameter called ______ Cetane number 1.0000000 0.0000000 FBQ4 Good quality diesel fuel required for modern diesel engine has cetane number greater than ______ 45 1.0000000 Forty five 1.0000000 0.0000000 FBQ5 Boiling point of a covalent substance depends upon the ______ forces. intermolecular 1.0000000 0.0000000 FBQ6 It has been found that molecules with odd number of carbon atoms have lower melting point than those with an even number of carbon atoms. True or false? true 1.0000000 0.0000000 FBQ7 The ______ in a carbon chain with an odd number of carbon atoms lies on the same side whereas those in a carbon chain with an even number lie on the opposite side. Terminal carbon atoms 1.0000000 0.0000000 FBQ8 All alkanes are lighter than water. True or false? true 1.0000000 0.0000000 FBQ9 Alkanes are soluble in polar solvents but insoluble in nonpolar solvents. True or false? false 1.0000000 0.0000000 0.0000000 FBQ10 UV spectroscopy is of important in the characteristic of alkanes. True or false? false 1.0000000 0.0000000 FBQ11 The joining of the two alkyl groups from two molecules of alkyl halide with the lost of halogen occur in which method of preparation of alkanes. ______ wurtz 1.0000000 0.0000000 0.0000000 FBQ12 Preparation of alkanes from carboxylic acid is achieved by ______ method. Kolbe’s electrolytic 1.0000000 0.0000000 FBQ13 Alkanes or cycloalkanes can be prepared by ______ of unsaturated hydrocarbons using platinum and palladium as a catalyst. hydrogenation 1.0000000 0.0000000 FBQ14 In Sabatier senderen’s reaction method, the hydrogenation of alkanes takes place in the presence of ______ catalyst. Nickel 1.0000000 Ni 1.0000000 FBQ15 Alkyl magnesium halide is also called ______ Grignard reagent 1.0000000 0.0000000 FBQ16 In decarboxylation of carboxylic acid, the alkanes produced contain one carbon atom less than the original acid. True or false. true 1.0000000 0.0000000 FBQ17 Cyclopentanone is prepared from which salt ______ barium adipate 1.0000000 0.0000000 FBQ18 When an alkene reacts with borane, addition to the carbon-carbon double bond takes place to yield an ______ organoborane 1.0000000 0.0000000 0.0000000 FBQ19 ______ can also be carried out by reacting ethyne and Grignard reagent, followed by the action of an alkyl halide. Alkylation 1.0000000 0.0000000 FBQ20 The common name for 1,3,5-trimethylbenzene is ______ Mesitylene 1.0000000 0.0000000 0.0000000 FBQ21 Alkanes undergo manly ______ reaction, which can be explained using free radical chain mechanism. substitution 1.0000000 0.0000000 0.0000000 FBQ22 The chemical reactions which take place in the presence of light are called ______ reactions Photochemical 1.0000000 0.0000000 FBQ23 Halogenation of alkanes does not occur in the dark but in the presence of ______ light. UV 1.0000000 0.0000000 0.0000000 FBQ24 In the chain initiation step of halogenation of alkanes, the halogen molecule undergoes ______ forming free radicals homolysis 1.0000000 0.0000000 FBQ25 In the second step of halogenation of alkanes, the halogen molecule abstract a hydrogen atom from the alkane molecule thereby producing an ______ alkyl radical 1.0000000 0.0000000 FBQ26 Alkenes can be classified on the basis of the number of ______ present in the molecules double bonds 1.0000000 0.0000000 0.0000000 FBQ27 Hydrocarbons containing two double bonds are called ______ diolefins 1.0000000 Alkadienes 1.0000000 Dienes 1.0000000 FBQ28 In the allene molecule the central carbon atom is sp hybridized while the terminal carbon atom is ______ sp2 hybridized 1.0000000 0.0000000 0.0000000 FBQ29 An alcohol is converted to alkene by ______ dehydration 1.0000000 0.0000000 FBQ30 In wittig reaction alkenes are synthesize from ______ compounds carbonyl 1.0000000 0.0000000 FBQ31 Alkenes are readily hydroxylated form a dihydroxy compound known as ______ glycols 1.0000000 diol 1.0000000 FBQ32 A reaction in which the double bond is completely broken and alkene molecule is converted into two smaller molecules is called ______ ozonolysis 1.0000000 0.0000000 FBQ33 Alkynes are divided into two, namely ______ Terminal and internal alkynes 1.0000000 0.0000000 0.0000000 FBQ34 A catalyst mixed with a selective inhibiting agent is called a ______ Poisoned catalyst 1.0000000 0.0000000 FBQ35 ______ is given a cetane number 100 Hexadecane 1.0000000 C16H34 1.0000000 Multiple Choice Questions (MCQs) MCQ1 In covalent bonding the formation of the bonds is usually accompanied by? Absorption of energy 0.0000000 Dissociation of bond 0.0000000 Release of energy 1.0000000 Formation of low stable molecules 0.0000000 MCQ2 The structure which shows how various atoms are connected to each other is called? Fischer structure 0.0000000 Lewis structure 1.0000000 Condense structure 0.0000000 spatial structure 0.0000000 MCQ3 The formula CH3CH3 represents the ____for ethane. Spatial structure 0.0000000 Lewis structure 0.0000000 Condense structure 1.0000000 None of the options 0.0000000 MCQ4 Give the name of this compound. CH3 (CH2)6CH3. Hexane 0.0000000 Propane 0.0000000 Butane 0.0000000 Octane 1.0000000 MCQ5 The condense formula for ethane is CH3CH3 while that of ethylene is? CH2CH2 0.0000000 CHCH3 0.0000000 HC=CH 0.0000000 H2C=CH2 1.0000000 MCQ6 When molecules are formed it can be deduced that? There was sharing of electron pair between atoms. 0.0000000 There was donation of electrons by one atom to another. 0.0000000 There was a molecular orbital interaction 0.0000000 All of the options. 1.0000000 MCQ7 The new orbitals formed in carbon and later interact with the orbitals of hydrogen to form? Interacting orbitals 0.0000000 Hybrid orbitals 1.0000000 2S and three 2P orbitals 0.0000000 Promoted orbitals 0.0000000 MCQ8 The symbol SP3 hybrid simply means One S and three P orbitals interaction 1.0000000 25 % S and 75 % P orbitals 0.0000000 Three S and one P orbitals 0.0000000 All of the options 0.0000000 MCQ9 What type of hybridization is peculiar to ethylene? SP3 hybridization 0.0000000 2SP3 hybridization 0.0000000 2SP2 hybridization 0.0000000 SP2 hybridization 1.0000000 MCQ10 SP3 hybrid orbitals are stronger and stable compare to the bonds formed by using pure atomic orbitals because____ SP3 hybrid orbitals have two lobes of unequal sizes. 0.0000000 SP3 hybrid orbitals are similar to p orbitals. 0.0000000 The lobes in SP3 hybrid orbitals are separated by anode. 0.0000000 In SP3 hybrid orbital, the electron density is concentrated in one direction leading to greater overlap. 1.0000000 MCQ11 What is the bond angle between two SP3 hybrid orbitals? 47.5o 0.0000000 18.5o 0.0000000 109.5o 1.0000000 107o 0.0000000 MCQ12 What is the name of the bond formed between carbon and hydrogen (C-H)? C-H Bond 0.0000000 a(alpha)bond 0.0000000 Sigma bond 1.0000000 p(pi) bond 0.0000000 MCQ13 What is the measure of the length of C-C bond? 164 pm 0.0000000 164 cm 0.0000000 154 cm 0.0000000 154 pm 1.0000000 MCQ14 The number of hybrid orbitals generated is equal to the number of__ orbitals combined. atomic 1.0000000 molecular 0.0000000 ionic 0.0000000 electronic 0.0000000 MCQ15 Grouping organic compounds base on their functional groups makes it easier to understand their___ Physical and chemical properties 0.0000000 Physical properties only 0.0000000 Chemical properties only 1.0000000 Structural properties only 0.0000000 MCQ16 What is the functional group of aldehyde? C-C=O 0.0000000 RCHO 0.5000000 -CHO 1.0000000 -COO- 0.0000000 MCQ17 A functional group can be defined as? An atom in a molecule which exhibit a characteristic chemical properties 0.0000000 A group of atoms in a molecule which exhibit a characteristic chemical properties 0.0000000 An atom or group of atoms in a molecule which exhibit a characteristic physical properties 0.0000000 An atom or group of atoms in a molecule which exhibit a characteristic chemical properties 1.0000000 MCQ18 The hydrocarbons are broadly classified into___ Saturated, unsaturated and aromatic 0.0000000 Alicyclic, heterocyclic and aromatic 0.0000000 Alkane, alkene and alkyne 0.0000000 Aliphatic, alicyclic and aromatic 1.0000000 MCQ19 In _______ reaction, a conjugated diene is treated with an unsaturated compound called dienophile to yield a cyclic system. Diels-Alder reaction 1.0000000 Wittig reaction 0.0000000 Wurtz reaction 0.0000000 Kolbe electrolytic reaction 0.0000000 MCQ20 Reactions that lead to the attachment of alkyl group to a molecular fragment are called ___. Acylation reaction 0.0000000 Addition reaction 0.0000000 Nucleophillic reaction 0.0000000 Alkylation reaction 1.0000000 MCQ21 ______ involves elimination of the halogen atom together with a hydrogen atom from an adjacent carbon atom. Dehydrohalogenation 1.0000000 halogenation 0.0000000 hydrohalogenation 0.0000000 Dihydrohalogenation 0.0000000 MCQ22 Alkyl halides are converted to alkenes by _____, hydrogenation 0.0000000 dehydrogenation 1.0000000 alkylation 0.0000000 acylation 0.0000000 MCQ23 Rapid decolourization of bromine solution serves as a test for the presence of the ___ in a compound. C-C 0.0000000 C=C 1.0000000 C=C 0.0000000 C=O 0.0000000 MCQ24 When alkene reacts with borane, addition to the C=C takes place to yield organoborane a compound with a carbon-boron bond, the reaction is known as ____. hydrogenation 0.0000000 halogenation 0.0000000 hydroboration 1.0000000 hydrohalogenation 0.0000000 MCQ25 In ___ compounds, the molecules are formed by the sharing of electron pairs between the constituent atoms. non-covalent 0.0000000 electrovalent 0.0000000 ionic 0.0000000 covalent 1.0000000 MCQ26 Which of these compounds have a benzene ring with a methyl group at position one? Aniline 0.0000000 Phenol 0.0000000 Toluene 1.0000000 Anisole 0.0000000 MCQ27 A benzene ring with a methyl group at position one and nitro group at position three is ___ o-nitrobenzene 0.0000000 p-nitroxylene 0.0000000 o-nitroaniline 0.0000000 p-nitrotoluene 1.0000000 MCQ28 What is the functional group of esters? -COOCO- 0.0000000 -COOH 0.0000000 RCOOR’ 1.0000000 -CHO 0.0000000 MCQ29 Which of these theoretical concept enables realistic modelling of molecular structure? hydrogenation 0.0000000 substitution 0.0000000 ionization 0.0000000 hybridization 1.0000000 MCQ30 Benzene is an example of which type of hydrocarbon? Alicyclic hydrocarbon 0.0000000 Arene hydrocarbon 0.0000000 Aromatic hydrocarbon 1.0000000 Alkene hydrocarbon 0.0000000 MCQ31 ____ determines the number of hybrid orbitals generated. Number of protons 0.0000000 Number of electrons 0.0000000 Number of atomic orbitals 0.0000000 Number of shells 1.0000000 MCQ32 When a compound has carbon-nitrogen double bond it is called? Amino 0.0000000 Amine 0.0000000 Imine 1.0000000 Nitrile 0.0000000 MCQ33 When a compound has carbon-nitrogen triple bond it is called? Amine 0.0000000 Amino 0.0000000 Imine 0.0000000 Nitrile 1.0000000 MCQ34 Depending on the number of alkyl group attached to the nitrogen atom, the amines are classified as? Imine, amino and amide 0.0000000 Saturated unsaturated and partially saturated 0.0000000 Primary, secondary and tertiary amines 1.0000000 First degree, second degree and third degree amines 0.0000000 MCQ35 In alcohol, when the oxygen atom is replaced by a sulphur atom is called ___ Sulphuric acid 0.0000000 Sulfhydryl 0.0000000 Thiol 1.0000000 Sulphurnol 0.0000000