FBQ1: Alkyl halides are converted into _________ by dehydrohalogenation Answer: alkenes FBQ2: The use of ____________ as octane number enhancer is being curtailed for environmental reasons. Answer: Tetraethyllead FBQ3: In _______, fuel having a lower octane number is much more useful than those having a higher octane number. Answer: diesel engine FBQ4: Quality of diesel fuel is expressed in terms of a parameter called__________. Answer: Cetane number FBQ5: _______is given a cetane number 100 Answer: Hexadecane FBQ6: Good quality diesel fuel required for modern diesel engine has cetane number greater than __________ Answer: 45 FBQ7: Boiling point of a covalent substance depends upon the__________ forces. Answer: intermolecular FBQ8: The function of hydroxide ion during dehydrohalogenation of alkyl halides is to abstract_______ from the carbon atom next to the halogen bearing carbon. Answer: hydrogen FBQ9: 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. Answer: Terminal carbon atoms FBQ10: Dehydration of alcohols which produce alkenes requires the presence of______. Answer: acid and heat FBQ11: George Witting reported a method of synthesising alkenes from_______ Answer: Carbonyl compounds FBQ12: A catalyst mixed with a selective inhibiting agent is called a ________ catalyst. Answer: poisoned FBQ13: 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. ___________ Answer: wurtz FBQ14: Preparation of alkanes from carboxylic acid is achieved by __________ method. Answer: Kolbe’s electrolytic FBQ15: Alkanes or cycloalkanes can be prepared by ____using platinum and palladium as a catalyst. Answer: hydrogenation of unsaturated hydrocarbons FBQ16: In Sabatier senderen’s reaction method, the hydrogenation of alkanes takes place in the presence of ________catalyst. Answer: Nikel FBQ17: Alkylmagnesium halide is also called_______ Answer: grignard reagent FBQ18: In the first step of Wittig reaction, the nucleophilic reagent _______ reacts with primary or secondary alkyl halide to give phosphonium salt. Answer: Triphenylphosphine FBQ19: The starting material or primary reactant used for the preparation of Cyclopentanone is known as _________. Answer: barium adipate FBQ20: When an alkene reacts with borane, addition to the carbon-carbon double bond takes place to yield an ___________ Answer: organoborane FBQ21: _____________ can also be carried out by reacting ethyne and Grignard reagent, followed by the action of an alkyl halide. Answer: Alkylation FBQ22: The common name for 1,3,5-trimethylbenzene is _________ Answer: Mesitylene FBQ23: Alkanes undergo manly _______ reaction, which can be explained using free radical chain mechanism. Answer: substitution FBQ24: The chemical reactions which take place in the presence of light are called ______reactions Answer: Photochemical FBQ25: Halogenation of alkanes does not occur in the dark but in the presence of _________light. Answer: UV FBQ26: In the chain initiation step of halogenation of alkanes, the halogen molecule undergoes ____forming free radicals Answer: homolysis FBQ27: In the second step of halogenation of alkanes, the halogen molecule abstract a hydrogen atom from the alkane molecule thereby producing an_________ Answer: alkyl radical FBQ28: Alkenes can be classified on the basis of the number of ________ present in the molecules Answer: double bonds FBQ29: Hydrocarbons containing two double bonds are called________ Answer: diolefins FBQ30: In the allene molecule the central carbon atom is sp hybridized while the terminal carbon atom is _______ hybridized Answer: sp2 FBQ31: An alcohol is converted to alkene by __________ Answer: dehydration FBQ32: In wittig reaction alkenes are synthesize from _________compounds Answer: carbonyl FBQ33: Alkenes are readily hydroxylated to form a dihydroxy compound (diol ) appropriately known as ________ Answer: glycols FBQ34: A reaction in which the double bond is completely broken and alkene molecule is converted into two smaller molecules is called________ Answer: ozonolysis FBQ35: Alkynes are divided into two, namely____________ Answer: Terminal and internal alkynes MCQ1: Choose the correct option that best indicate the hybrid orbitals type, bond length and bond angle for methane. Answer: SP2, 134 pm and 120o MCQ2: Choose the correct option that best indicate the hybrid orbitals type, bond length and bond angle for acetylene? Answer: SP, 120 pm and 180o MCQ3: Grouping organic compounds based on their functional groups makes it easier to understand their_______? Answer: Chemical properties only MCQ4: -OH is a functional group for which organic compound? Answer: Alcohol MCQ5: What is the functional group of aldehyde? Answer: ─CHO MCQ6: What is the functional group of esters? Answer: RCOOR’ MCQ7: A functional group can be defined as? Answer: An atom or group of atoms in a molecule which exhibit a characteristic chemical properties MCQ8: The hydrocarbons are broadly classified into three namely___? Answer: Aliphatic, alicyclic and aromatic MCQ9: Benzene is an example of which type of hydrocarbon? Answer: Aromatic hydrocarbon MCQ10: When a compound has a carbon-nitrogen single bond it is called? Answer: amine MCQ11: When a compound has carbon-nitrogen double bond it is called? Answer: Imine MCQ12: When a compound has carbon-nitrogen triple bond it is called? Answer: Nitrile MCQ13: Amines are appropriately classified bases on the number of alkyl group attached to the nitrogen atom as; Answer: Primary, secondary and tertiary amines MCQ14: An alcohol in which the oxygen atom is replaced by a sulphur atom is called? Answer: Thiol MCQ15: An aromatic compound which contained side chain hydroxyl group is called? Answer: Phenol MCQ16: The earliest nomenclature of the organic compounds was based on? Answer: Their origin or properties MCQ17: What are isomers? Answer: Are compounds having the same molecular formula but different structural presentation MCQ18: n-butane means? Answer: Straight chain butane MCQ19: Iso-butane means? Answer: Branched butane MCQ20: The number of possible isomers of an alkane increases with increase in number of carbon atoms. True or false. Answer: True MCQ21: A member of a homologue series must poses a similar structure but differ in the ___ repeating unit. Answer: ─CH2─ MCQ22: ‘Undecane’ is a straight chain alkane containing how many carbon atoms? Answer: 11 MCQ23: In _________________ reaction, a conjugated diene is treated with an unsaturated compound called dienophile to yield a cyclic system. Answer: Diels-Alder MCQ24: The terminal alkynes on hydroboration give _________________________. Answer: aldehydes MCQ25: Reactions that lead to the attachment of alkyl group to a molecular fragment are called ____________________________. Answer: Alkylation reaction MCQ26: __________________ involves elimination of the halogen atom together with a hydrogen atom from an adjacent carbon atom. Answer: Dehydrohalogenation MCQ27: Alkyl halides are converted into alkenes by _______________, by treating with a strong base. Answer: dehydrogenation MCQ28: Rapid decolourization of bromine solution serves as a test for the presence of the ___________________ in a compound. Answer: C=C MCQ29: 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 ____________________. Answer: hydroboration MCQ30: In _____________ compounds, the molecules are formed by the sharing of electron pairs between the constituent atoms. Answer: covalent MCQ31: Which of these compounds have a benzene ring with a methyl group at position one? Answer: Toluene MCQ32: A benzene ring with a methyl group at position one and nitro group at position three is _____? Answer: p−nitrotoluene MCQ33: Which of these theoretical concepts enables realistic modelling of molecular structure? Answer: hybridization MCQ34: ____________ is how a sigma (δ) bond is formed. Answer: edge-on overlap of pure s and p orbitals MCQ35: The relationship between bond length and bond order is ___________. Answer: Bond order increases as bond length decreases