Basic Principles of Organic Chemistry — practice questions
147 curated practice questions from Basic Principles of Organic Chemistry (Chemistry JEE Advanced, NTA Exams) — 145 hard, 2 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.
- Assertion (A) : Tropylium cation is more stable than ( CH _ 3 )_ 3 C ^ Reason (R) : It is stabilized by both resonance…
- Which of the following will have least hindered rotation about carbon-carbon bond ?
- An organic compound (A) (C 10 H 20 ) on reductive ozonolysis gives 2-methyl butanal. Based on this information, answer…
- Which statement explains why the element carbon forms so many compounds with different shape?
- array ccc - F & - COOCH _ 3 & - COCl I & II & III array Which of these groups has –I effect ?
- Hyperconjugation involves overlap of the following orbitals (2008)
- Which of the following have larger C—O bond length than C—O bond length of
- Let Γ denote a curve y = y ( x ) which is in the first quadrant and let the point (1, 0) lies on it. Let the tangent to…
- Which of the following resonating structures of 1-methoxy-1, 3-butadiene is least stable ? (2005)
- In the following carbocation ; H/CH 3 that is most likely to migrate to the positively charged carbon is (2009)
- Among the following, the least stable resonance structure is (2007)
- CH 3 CH 2 NO 2 will show ........... isomerism
- An organic molecule necessarily shows optical acitvity if it
- Which of the following swithing or rotating Fischer structures changes its absolute configuration?
- With respect to the compounds I-V, choose the correct statement(s). array l I II H- CH _ 3 III IV V array
- Assertion (A) : Tertiary carbocations are generally formed more easily than primary carbocations. Reason (R) …
- Hyperconjugation is no bond resonance. It involves σ electrons of C—H bond. Greater the number of C — H bonds…
- Hyperconjugation is no bond resonance. It involves σ electrons of C—H bond. Greater the number of C — H bonds…
- What is the decreasing order of strength of the bases ? OH ^ - , NH _ 2 ^ - , H - C C ^ - and CH _ 3 - CH _ 2 ^ -
- Assertion : Alkenes containing more than three carbons exhibit chain isomerism. Reason : All the carbon atoms in…
- The three carbanions follows which order of stability array l (I) (II) (III) array
- Which is/are correct statements about P and Q ?
- Which of the following is least stable? array l (I) (II) (III) array
- Assertion : Both cis -1,3-Dimethyl cyclobutane and trans -1,3-dimethyl cyclobutane are optically inactive. Reason : cis…
- A racemic mixture containing following enantiomers are to be separated into pure enantiomers by reacting with a pure…
- The correct order of acidity for the following compounds is (2013) array l I II III array
- Which of the following hydrocarbons has the lowest dipole moment ? (2002)
- The total number of contributing structures showing hyperconjugation (involving C–H bonds) for the following…
- Assertion 1,3-dichloro propadiene rotate plane polarized light. Reason The molecules of 1,3-dichloro propadiene are…
- The compound in which C uses its sp 3 -hybrid orbitals for bond formation is (2000)
- Consider the following four compounds I, II, III, and IV. array l I II III IV array Choose the correct statement(s)…
- Rearrangement in this carbocation will produce
- Which of the following no-bond-canonical structures is correct for this radical ?
- Which of the following alkyl benzenes has maximum electron density?
- The correct acidity order of the following is array l (I) (II) (III) (IV) array
- The correct arrangement of the relative stability of the three carbocation is : array l (I) (II) (III) array
- Which is the major product of the following reaction ?
- The correct stability order for the following species is (2008) (I) (II) (III) (IV)
- array l (I) (II) (III) array Which of the following orders is correct for the stability of these carbocations ?
- Which one of the following compound will show geometrical isomerism ?
- (I) CH 3 NH 2 (II) (CH 3 ) 2 NH (III) (CH 3 ) 3 N Which of the following orders is correct for the basic-strength of…
- Relative stabilities of the following carbocation will be in order : array l (I) (II) (III) CH _ 3 C H _ 2 (IV) array
- When (C—H) σ electrons are in conjugation to pi bond, this conjugation is known as hyperconjugation : For any compound…
- Number of isomers which can be obtained theoretically on monochlorination of 2–methylbutane is
- An organic compound (A) (C 10 H 20 ) on reductive ozonolysis gives 2-methyl butanal. Based on this information, answer…
- An organic compound (A) (C 10 H 20 ) on reductive ozonolysis gives 2-methyl butanal. Based on this information, answer…
- Assertion (A) : The C C distance is longer than C = C distance Reason (R) : Both C atoms in alkenes are sp 2 hybridized.
- The compound which is not isomeric with diethyl ether is
- (I) CH 3 NH 2 (II) (CH 3 ) 2 NH (III) (CH 3 )N Which of the following orders is correct for the basic-strength of these…
- CH 2 =CH–CH=CH–CH=CH–CH 3 How many geometrical isomers of this compound are possible ?
- How many structural (including stereoisomers) isomers could be obtained by replacing one hydrogen of propene with…
- Among the following compounds, the most acidic is (2011)
- Which of the following represents the given mode of hybridisation sp 2 – sp 2 – sp – sp from left to right ? (2003)
- Assertion (A) : Conjugated dienes are more stable than non-conjugated dienes. Reason (R) : 1,4-Pentadiene is a…
- The correct statement(s) about the compound given below is (are) (2008)
- An organic compound (A) (C 10 H 20 ) on reductive ozonolysis gives 2-methyl butanal. Based on this information, answer…
- Count the number of stereocentres in the molecule below
- Number of stereoisomers of the compound 2–chloro–4–methylhex–2–ene is
- An organic compound having only C, H atoms has a molecular wt. 86 . By nature it is a liquid compound and it is capable…
- Assertion (A) : CHCl = CHBr exhibits geometrical isomerism. Reason (R) : Presence of C = C is the condition for a…
- Assertion : Structural isomers have different physical and chemical properties. Reason : Structural isomers have…
- Which of the following combinations amongst the four Fischer projections represents the same absolute configurations?…
- Newman projections P, Q, R and S are shown below : array l Q R S P array Which one of the following options represents…
- Which of the following orders is correct for the basic-strength of these compounds ?
- Assertion : Compound possessing same molecular formula but differing in their physical and chemical properties are…
- Hyperconjugation is no bond resonance. It involves σ electrons of C—H bond. Greater the number of C — H bonds…
- Which of the following compounds will exhibit cis-trans (geometrical) isomerism?
- array cccc - CHO & - COOH & - CN & - NO _ 2 I & II & III & IV array Among these groups, which of the following orders…
- Which of the following compounds will show highest dipole moment (2018) array l (1) (11) (ITT) (IV) array
- Which of the statements are incorrect about the following compound ?
- This compound can be named as
- array l (I) (II) (III) array Which of the following orders is correct for the basic-strength of these anilines ?
- The Fischer projection of D-erythrose is shown below. D-Erythrose D-Erythrose and its isomers are listed and P, Q, R…
- Consider the following structures (i) CH _ 2 = C H (ii) CH _ 3 - C H _ 2 (iii) CH _ 2 = CH - C H _ 2 (iv) C _ 6 H _ 5 …
- The degree of unsaturation or index of hydrogen deficiency in the following is: (i) C 6 H 14 (ii) C 4 H 6 (iii) C 6 H 6
- The correct order of stability of the three isomeric carbanions is: array l (I) (III) array
- array ccc - CH _ 3 & - CH = CH _ 2 & - C CH II & III array Which of these groups has +I effect ?
- How many possible carboxylic acids and esters are for a compound with molecular formula C 4 H 8 O 2 ?
- Following pair of molecules are related as and
- Asseration (A) : p-nitrophenol is a stronger acid than o-nitrophenol. Reason (R) : Intramolecular hydrogen bonding make…
- Which of the following molecules is identical with that represented by
- Correct order of basicity of various nitrogen in
- Assertion (A) : All carbon atoms in 1,3-butadiene are sp 2 hybridized. Reason (R) : 1,3-Butadiene is a conjugated diene.
- Which of the following compound can exhibit geometrical isomerism ?
- The reaction represents
- What is the decreasing order of stability (most stable → least stable) of the following carbocations ?
- The optically active tartaric acid is named as D-(+)-tartaric acid because it has a positive
- How many open chain structural isomers of compound with molecular formula C 6 H 12 show geometrical isomerism ?
- Arrange following compounds in decreasing order of basicity.
- CH 3 –CH 2 –CH=CH–CH=CH–CH 3 How many geometrical isomers of this compound are possible ?
- When (C—H) σ electrons are in conjugation to pi bond, this conjugation is known as hyperconjugation : For any compound…
- Assertion (A) : The acetate ion is a weaker base than the ethoxide ion. Reason (R) : In carboxylic acids, the carbonyl…
- Which of the following is most likely to undergo a favourable hydride shift ?
- The number of isomers of C 6 H 14 is ( 2007)
- The Fischer projection that represent enantiomer of the given sawhorse projection is
- How many geometrical isomers of this bromonium ion are possible?
- The IUPAC name(s) of the following compound is (are) (2017)
- Among the following, the conformation that corresponds to the most stable conformation of meso-butane-2,3-diol is (2021)
- A racemic mixture containing following enantiomers are to be separated into pure enantiomers by reacting with a pure…
- The most stable conformer of meso-1,2-dibromo-1,2-dichloro ethane is
- Which of the following cyclopentane derivative is/are optically active ?
- Which of the following will show optical isomerism as well as geometrical isomerism?
- The number of stereoisomers obtained by bromination of trans-2-butene is (2007)
- Which of the following options is the correct order of relative stabilities of cations as written below (most stable…
- A solution contain three stereoisomers of 2,3-dihydroxy butanedioic acid. On fractional crystallization of this…
- Arrange in order of increasing acidic strength (2004)
- Which of the following alkenes are more stable than
- Identify the correct order of boiling points of the following compounds (1) CH 3 CH 2 CH 2 CH 2 OH (2) CH 3 CH 2 CH 2…
- This compound can be named as
- Assertion : 1,2-dichloro cyclopropane show geometrical isomerism Reason : It has restricted rotation of atoms about a…
- Arrange the following in decreasing order of stability. array l (I) (II) (III) array
- Assertion (A) : The carbocation CF _ 3 - C H _ 2 is less stable than C ~F _ 3 . Reason (R) : In case of CF _ 3 - C H _…
- The correct combination of names for isomeric alcohols with molecular formula C 4 H 10 O is/are
- The correct stability order of the following resonance structure is (2009)
- Among the following alkenes (I) 1–Butene (II) cis–2–Butene (III) trans–2–Butene the decreasing order of stability is
- Assertion (A) : The two structures, CH 3 – CH 2 – CH 2 – C CH and are chain isomers. Reason (R) : The chain isomers…
- Regarrangement in this carbocation will produce
- Which of the following compounds exhibits, stereoisomerism ? (2002)
- Which of the following acids has the smallest dissociation constant ? (2002)
- Which of the following alkenes will exhibit geometrical isomerism ?
- An organic compound having only C, H atoms has a molecular wt. 86 . By nature it is a liquid compound and it is capable…
- A solution contain three stereoisomers of 2,3-dihydroxy butanedioic acid. On fractional crystallization of this…
- The correct order of basicities of the following compounds is (2001)
- Which of the following is obtained when 4-methylbenzene sulphonic acid is hydrolysed with excess of sodium acetate ?…
- The IUPAC name(s) of the following compound is (are) (2017)
- Which of the Fischer projection formula correspond to the following stereostructure?
- Which of the following, has the most acidic hydrogen ? (2000)
- A solution contain three stereoisomers of 2,3-dihydroxy butanedioic acid. On fractional crystallization of this…
- Assertion : Enantiomers differ in their chemical action with other enantiomer. Reason : A pair of enantiomers have…
- Which of the following on standing in dilute, aqueous basic solution will undergoes racemization?
- An organic compound having only C, H atoms has a molecular wt. 86 . By nature it is a liquid compound and it is capable…
- Br has low reactivity in CH _ 2 = CH - Br because
- Write the correct order of acidity: (P) (Q) (R) (S)
- Which of the following operations on the Fischer formula does not changes its absolute configuration?
- Assertion : Meso–tartaric acid is optically active. Reason : Optically active molecule is a molecule that cannot be…
- The correct statement(s) concerning the structures E, F and G is (are) (2009)
- Statement–1 : Molecules that are non-superimposable on their mirror images are chiral. Statement–2 : All chiral…
- array l (I) (II) (III) array Which of the following orders is correct for the stability of these carbanions ?
- Assertion (A) : Ethylene is more reactive than ethane. Reason (R) : Ethylene possess π bond.
- Amongst the given options, the compounds in which alll the atoms are in one plane in all the possible conformations (if…
- The hybridization of carbon in diamond, graphite and acetylene are respectively:
- The molecular formula of diphenyl methane is C 13 H 12 . How many structural isomers are possible when one of the…
- The correct statement (s) about the compound H 3 C(HO) HC–CH=CH–CH(OH)CH 3 (X) is (are) (2009)
- Assertion : Cyclobutane is less stable than cyclopentane. Reason : Presence of ‘bent bond’ causes loss of orbital…
- array l (I) (II) (III) array Which of the following orders is correct for the stability of these carbocations ?
- How many optically active stereoisomers are possible for butane–2, 3–diol?
- Which one of the following compounds cannot show tautomerism ?