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CBSE Class 11 (Science) Organic Chemistry: Some Basic Principles and Techniques — practice questions
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Practice CBSE Class 11 (Science) Organic Chemistry: Some Basic Principles and Techniques in the app →As per your syllabus, the property of carbon that allows it to form long chains with itself is called what?As per your syllabus, the relative ELECTRONEGATIVITY of carbon hybridised as sp, sp², sp³ goes in which order?As per your syllabus, rotation about a C=C double bond in ethene (H₂C=CH₂) is best described as which?As per your syllabus, the bond LENGTHS of single bonds formed by sp, sp², sp³ carbons go in which order?As per your syllabus, in HC≡C-CH=CH-CH₃ the total number of σ and π bonds is which set?As per your syllabus, the hybridisation of carbon in HC≡N (hydrogen cyanide) is which?As per your syllabus, open-chain hydrocarbons (straight or branched) are also called by which name?As per your syllabus, (a), tetrahydrofuran (a 5-membered ring with one O) is best classified as which kind?As per your syllabus, (b), furan, thiophene, and pyridine are examples of which kind of compounds?As per your syllabus, successive members of a HOMOLOGOUS SERIES differ from each other in molecular formula byAs per your syllabus, the first step in naming a branched alkane is to identify which feature?As per your syllabus, rule 2, when numbering the parent chain, the goal is to give substituents which kind of As per your syllabus, rule 3, when listing different alkyl substituents in the IUPAC name, the order is which?As per your syllabus, rule 4, when there are TWO identical substituents on the parent chain, the prefix used iAs per your syllabus, Problem 8.7(a), the correct IUPAC name for CH₃-CH(CH₃)-CH₂-CH₂-CH(CH₃)-CH(CH₃)-CH₂-CH₃ iAs per your syllabus, the IUPAC SUFFIX for an aldehyde (-CHO) functional group is which?As per your syllabus, the IUPAC SUFFIX for a ketone (>C=O) functional group is which?As per your syllabus, in a polyfunctional compound with both -COOH and -OH groups, the PRINCIPAL functional grAs per your syllabus, example, HOCH₂(CH₂)₃CH₂COCH₃ should be named as which?As per your syllabus, in trivial nomenclature of disubstituted benzene, the prefix indicating 1,4-positions isAs per your syllabus, in IUPAC nomenclature, the benzene ring as a substituent (C₆H₅-) is called by which nameAs per your syllabus, example, CH₃-CO-CH₂-CH₂-CH₂-COOH is named as which?As per your syllabus, n-pentane and 2,2-dimethylpropane (neopentane) are examples of which kind of isomerism?As per your syllabus, propan-1-ol and propan-2-ol are examples of which kind of isomerism?As per your syllabus, propanal (CH₃CH₂CHO) and propanone (CH₃COCH₃) (both C₃H₆O) are examples of which isomeriAs per your syllabus, methoxypropane (CH₃OC₃H₇) and ethoxyethane (C₂H₅OC₂H₅) (both C₄H₁₀O) are examples of whiAs per your syllabus, in HETEROLYTIC cleavage of a covalent bond, the shared pair of electrons goes to which fAs per your syllabus, in HOMOLYTIC cleavage of a covalent bond, the shared pair of electrons goes to which fraAs per your syllabus, the observed STABILITY order of carbocations from least to most stable is which?As per your syllabus, the methyl carbocation (CH₃⁺) has which geometry and hybridisation?As per your syllabus, a CARBANION has the central carbon in which hybridisation and shape?As per your syllabus, a species formed by homolysis with an unpaired electron is called which?As per your syllabus, a NUCLEOPHILE is best described as which kind of species?As per your syllabus, which of these is best classified as an ELECTROPHILE?As per your syllabus, the INDUCTIVE EFFECT in a chain of σ-bonds is best described as which?As per your syllabus, the inductive effect typically becomes vanishingly small after how many intervening bondAs per your syllabus, which group acts as an ELECTRON-DONATING group by inductive effect (+I)?As per your syllabus, in CH₃-CH₂-CH₂-Br, the inductive effect is felt LEAST in which bond?As per your syllabus, the experimentally observed C-C bond length in benzene is which value?As per your syllabus, the POSITIVE RESONANCE effect (+R) transfers electrons in which direction?As per your syllabus, the NEGATIVE RESONANCE effect (-R) transfers electrons in which direction?As per your syllabus, which substituent shows a -R (negative resonance) effect?As per your syllabus, the ELECTROMERIC EFFECT (E) is best described as which kind of effect?As per your syllabus, when inductive and electromeric effects oppose each other, which effect predominates?As per your syllabus, HYPERCONJUGATION involves the delocalisation of which type of electrons?As per your syllabus, in the ethyl cation (CH₃CH₂⁺), the C-H σ-electrons of which group delocalise into the emWhich type of bond transmits the inductive effect along a carbon chain?Alkyl groups attached to a carbon chain show which electronic effect?How does the inductive effect change as distance from the substituent increases?The inductive effect is best described as which kind of electronic effect?In a polar covalent bond, the more electronegative atom carriesAcetic acid is weaker than formic acid because its methyl groupWhich of these acids is the strongest in water?As an acid becomes stronger, its pKa valueBenzoic acid is stronger than cyclohexanecarboxylic acid because its ring carbons areDiacids are usually stronger because a carboxyl group isA positively charged carbon attached to a +I group becomesAttaching more +I groups to a molecule generallyWhen the attacking reagent is an electrophile, which electromeric effect is generally seen?The concepts of electromeric and mesomeric effects are now absorbed into which broader term?A carbocation is an ion containingWhat is the usual hybridisation of the positive carbon in a simple carbenium ion?The LUMO on the charged carbon of a planar carbenium ion isHow many valence electrons surround the positive carbon of a carbenium ion?What is the coordination number of the charged carbon in a carbonium ion such as CH5+?Extra methyl groups stabilise a carbocation by hyperconjugation as they add moreHyperconjugation is also known asHyperconjugation involves delocalisation of electrons fromBy hyperconjugation, alkenes become more stable whenHyperconjugation is proposed to explain why ethane prefers itsA nucleophile forms bonds byBecause they donate electron pairs, nucleophiles are classed asBetween comparable sulfur and oxygen nucleophiles, which is generally stronger?An ion such as thiocyanate, which can attack through two different atoms, is calledGrignard reagents and organolithium compounds commonly serve asA nucleophilic reaction in which a neutral solvent such as water or an alcohol is the nucleophile is calledWhich of these species behaves as an electrophile?Carbenes and free radicals can act as electrophiles mainly because theyResonance in molecules is also calledCompared with any single contributor, the resonance hybrid isResonance energy is the energy gap between the real molecule andAll resonance contributors of a species must have the sameResonance contributors of a molecule differ from one another only in theA major resonance contributor places any negative charge on theAll carbon-carbon bonds in benzene measure aboutHow many dibromobenzene isomers actually exist?In a carboxylate ion RCOO-, the negative charge isUnlike typical alkenes, benzene mainly undergoesStructural isomers have the same molecular formula but differ inPropanal and acetone are an example of which type of isomerism?