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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 801. |
Assertion : Each carbon in ethylene molecule is `sp^(2)` hybridised. Reason : The H-C-H bond angle in ethylene molecule is `120^(@)`.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true of the reason is false.D. If the assertion and reason both are false. |
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Answer» Correct Answer - B Each carbon atom in ethylene is attached to two hydrogen atoms by single covalent bonds and to another carbon atoms by a double bond. Since each carbon is attached to three other atoms, it uses `sp^(2)` hybrid orbitals and an unhybridised `p_(z)` orbitals to form its bond. Each C-H bond is a `sigma` bond resulting from the overlap of 1 s orbital of hydrogen atom and `sp^(2)` orbital of a carbon atom. One C-C bond results from the linear overlap of `sp^(2)` orbitals one from each carbon atoms. One `pi` bonds results from the lateral overlap of two unhybridised `p_(z)` orbitals, one from each carbon atom. |
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| 802. |
The C-C bond length of the following molecules is in the orderA. `C_(2)H_(6) gt C_(2)H_(4) gt C_(6)H_(6) gt C_(2)H_(2)`B. `C_(2)H_(2) lt C_(2)H_(4) lt C_(6)H_(6) lt C_(2)H_(4)`C. `C_(2)H_(6) gt C_(2)H_(2) gt C_(6)H_(6) gt C_(2)H_(4)`D. `C_(2)H_(4) gt C_(2)H_(6) gt C_(2)H_(2) gt C_(6)H_(6)` |
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Answer» Correct Answer - B `underset(1.20 Å)(C_(2)H_(2)) lt underset(1.34 Å)(C_(2)H_(4))lt underset(1.39 Å)(C_(6)H_(6)) lt underset(1.54 Å)(C_(2)H_(6))` |
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| 803. |
The number of sigma `(sigma)` and pi `(pi)` bonds present in 1,3,5,7-octatetraene respectively are:A. 14 and 3B. 17 and 4C. 16 and 5D. 15 and 4 |
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Answer» Correct Answer - B `underset(17 sigma and 4pi)underset("1,3,5,7-octatetraen")(H overset(sigma)(-)underset(H)underset(|sigma)(C)underset(pi)overset(sigma)(=)underset(H)underset(|sigma)(C)overset(sigma)(-)underset(H)underset(|sigma)(C)underset(pi)overset(sigma)(=)underset(H)underset(|sigma)(C)overset(sigma)(-)underset(H)underset(|sigma)(C)underset(pi)overset(sigma)(=)underset(H)underset(|sigma)(C)overset(sigma)(-)underset(H)underset(|sigma)(C)underset(pi)overset(sigma)(=)underset(H)underset(|sigma)(C)overset(sigma)(-)H)` |
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| 804. |
The enolic form of butanone containsA. `12 sigma` bonds, `1pi` bond and 2 lone pairs of electronsB. `11 sigma` bonds , `1pi` bond and 2 lone pairs of electronsC. `12 sigma` bonds , `1pi` bond and 1 lone pairs of electronsD. `10 sigma` bonds , `2pi` bond and 2 lone pairs of electrons |
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Answer» Correct Answer - A `CH_(3)-underset("Keto form")(CH_(2))-overset(O)overset(||)(C)-CH_(3)hArr CH_(3)-underset("enolform")(CH_(2)-)overset( :overset(..)OH)overset(|)(C)=CH_(2)` Enol form of butanone contains `12 sigma` bond, `1pi` bond and 2 lone pairs of electrons. |
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| 805. |
The enolic form of acetone containsA. 9 sigma bonds, 1 pi bond and 2 lone pairsB. 8 sigma bonds, 2 pi bond and 2 lone pairsC. 10 sigma bonds, 1 pi bond and 1 lone pairsD. 9 sigma bonds, 2 pi bonds and 1 lone pair |
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Answer» Correct Answer - A Enolic form of acetone is `underset("Enolic form")(CH_(2)=overset(OH)overset(|)(C)-CH_(3)) " " underset("Keto form")(CH_(3)-overset(O)overset(||)(C)-CH_(3))` `H underset(sigma)-overset(H)overset(|sigma)(C)underset(pi)overset(sigma)=overset(overset(..sigma)( :O-H))overset(|sigma)(Cunderset(sigma)-)underset(H)underset(|sigma)overset(H)overset(|sigma)(C)overset(sigma)-H`, Hence, `sigma` -bonds = 9, `pi` -bonds = 1, lone pair =2 |
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| 806. |
Which one is the correct order of acidity ?A. `CH = CH gt CH_(3) - C -= CH gt CH_(2) = CH_(2) gt CH_(3) - CH_(3)`B. `CH = CH gt CH_(2) = CH_(2) gt CH_(3) - C -= CH gt CH_(3) - CH_(3)`C. `CH_(3) - CH_(3) gt CH_(2) = CH_(2) gt CH_(3) - C -= CH gt CH = CH`D. `CH_(2) = CH_(2) gt CH_(3) - CH = CH_(2) gt CH_(3) - C -= CH gt CH -= CH` |
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Answer» Correct Answer - A Correct order of acidic strength `rArr` `CH = CH gt CH_(3) - C = CH gt CH_(2) = CH_(2) gt CH_(3) - CH_(3)` acc. To. EN and Inductive effect. |
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| 807. |
Assertion : Free radicals are short lived and highly reactive. Reason : Free radicals are highly unstable.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false. |
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Answer» Correct Answer - B Since free radicals contain odd electrons, so they are short lived and they readily try to pair up the odd electrons to form neutral molecules, that is why they are highly reactive. |
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| 808. |
Assertion : Same number of electron pairs are present in resonance structures. Reason : Resonance structures differ in the location of electrons around the constituent atoms.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true.. |
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Answer» Correct Answer - D Resonance structures contain the same number of unpaired electrons. |
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| 809. |
Which of the following is the most stable compound?A. `Ph_(3)overset(+)(C)`B. `Ph_(2)overset(+)(C)H`C. `Ph_(3)Coverset(+)(C)H_(2)`D. `Phoverset(+)(C)H_(2)` |
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Answer» Correct Answer - A Triphenyl methyl cation has three benzene resonating ring so it is most stable compound. |
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| 810. |
Among the following, the molecule with the highest dipole moment is :A. `CH_3Cl`B. `CH_2Cl_2`C. `CHCl_3`D. `C Cl_4` |
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Answer» Correct Answer - A (a) |
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| 811. |
Which among following statements are correct?A. Energy needed for homolytic bond fission is less than that requried for the hetroytic bond fissionB. Homolytic bond fission gives neutral speciec which is paramagnetic for theC. Homolytic bond fission takes place in non polar solventsD. Cation and anion is produced by heterolytic bond fission |
| Answer» Correct Answer - A::B::D | |
| 812. |
Which of the following has the smallest heat of hydrogenation per mole ?A. 1-buteneB. Trans-2-buteneC. Cis-2-buteneD. 1, 3 butadiene |
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Answer» Correct Answer - D 1, 3-butadiene shows smallest heat of hydrogenation due to its higher stability (which is due to resonance) Trans-2-butene is more stable than cis-2-butene on the basis of heat of hydrogenation. 1-butene is less stable than 2-butene due to hyper conjugation. `CH_(3)-CH=CH-CH_(3)` (Shows six no-bond resonating structures) While, 1-butene due to hyperconjugation shows two no-bond resonating structures. (Resonance is more powerful than hyperconjugation) Order of stability 1, 3-butadiene `gt` trans-2-butene `gt` cis-2-butene `gt` 1-butene Heat of hydrogenation 1-butene `gt` cis-2-butene `gt` trans-2-butene `gt` 1, 3-butadiene |
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| 813. |
Which of these statement are correct?A. Stability of alkyl carbanion can be explained by hyperconjugationB. C. D. B.pt. of o-nitrophenol is less than p-nitrophenol |
| Answer» Correct Answer - B::C::D | |
| 814. |
The decreasing order of electron density on the ring is : A. `IIIgtIIgtI`B. `IIgtIIIgtI`C. `IgtIIIgtII`D. `IIIgtIgtII` |
| Answer» Correct Answer - A | |
| 815. |
Which one has asymmetric C-atomA. `{:(CH_(3)-CH_(2)-CH_(2)),(" |"),(" "Br):}`B. `{:(CH_(3)-CH-CH-CH_(3)),(" |"" |"),(" "Br" "CH_(3)):}`C. `{:(CH_(3)-CH_(2)-CH-CH_(3)),(" |"),(" "Br):}`D. `{:(" "CH_(3)),(" |"),(CH_(3)-C-CH_(2)-CH_(2)-CH_(2)),(" |"),(" "Br):}` |
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Answer» Correct Answer - B::C `{:(" "H),(" |"),(CH_(3)-C^(**)-CH-CH_(3)),(" |"" |"),(" "Br" "CH_(3)):}` and `{:(" "H),(" |"),(CH_(3)-CH_(2)-C^(**)-CH_(3)),(" |"),(" "Br):}` |
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| 816. |
Which of the following pairs have same dipole momentA. B. C. D. |
| Answer» Correct Answer - A::C::D | |
| 817. |
Correct dipole moment order is A. `pgtqr`B. `rgtqgtp`C. `qgtrgtp`D. `pgtrgtq` |
| Answer» Correct Answer - B | |
| 818. |
Which of the following are electrophiles?A. `BF_(3)`B. `AlCl_(3)`C. `H_(3)overset(o+)O`D. `R_(4)overset(o+)N` |
| Answer» Correct Answer - A::B | |
| 819. |
Which of the following are nucleophiles?A. `CN^(Ɵ)`B. `BF(3)`C. `R-O-P`D. `NH_(3)` |
| Answer» Correct Answer - A::C::D | |
| 820. |
Geometry of reaction intermediate in `S_(N^(1))` reaction isA. TetrahedralB. PlanarC. Triangular bipyramidalD. None of these |
| Answer» Correct Answer - B | |
| 821. |
`Br_(2)+H_(2)O rarr Br^(-) + BrO_(3)` In the above reaction, following takes place aA. Bromine undergoes oxidation & reductionB. Bromine is oxidised onlyC. Bromine is reduced onlyD. None |
| Answer» Correct Answer - A | |
| 822. |
The correct IUPAC name of spiro compound is A. 5-oxospiro [3,4] octaneB. 1-oxospiro [4,3] octaneC. 5-oxospiro [3,4] octaneD. 1-oxospiro [3,4] octane |
| Answer» Correct Answer - A | |
| 823. |
The following questions refer to the twelve compounds given below. You may enter as many as six choices in each answer box. Which compound may serve only as H-bond donors ? |
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Answer» Correct Answer - A-a ,c, f, g,k (A) compounds having L.P. or -ve charge on electronegative atoms are known as H-bond acceptor. |
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| 824. |
Which of the carbon -substituted phenol derivations above is the strongest acid ? square Compound C square Compound F |
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Answer» Correct Answer - F `-overset(O)overset(||)(C)-Me` at para-position has -M so increases acidic strength . |
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| 825. |
Which of the following compound have wrong IUPAC nameA. `CH_(3)-CH_(2)-CH_(2)-COO-CH_(2)CH_(3) rarr` ethyl butanoateB. `{:(CH_(3)-CH-CH_(2)-CHO rarr),(" |"),(" "CH_(3)):}` 3-methyl-butanalC. `{:(CH_(3)-CH-CH-CH_(3) rarr),(" |"" |"),(" "OH" "CH_(3)):}` 2-methyl-3-butanolD. `{:(" "O),(" ||"),(CH_(3)-CH-C-CH_(2)-CH_(3)rarr),(" |"),(" "CH_(3)):}` 2-methyl-3-pentanone |
| Answer» Correct Answer - C | |
| 826. |
The `IUPAC` name of `CH_(3)COCH(CH_(3))_(2)` isA. Isopropylmethyl ketoneB. 2-methyl-3-butanoneC. 4-methylisopropyl ketoneD. 3-methyl-2-butanone |
| Answer» Correct Answer - D | |
| 827. |
The quantum mechanical picture of a carbocation is exactly the same as that ofA. `BF_(3)`B. `NF_(3)`C. `FeF_(3)`D. `CoF_(3)` |
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Answer» Correct Answer - A `BF_(3)` molecules is flat like a carbocation. Infrared and Raman spectra of the tert-butyl cation are strikingly similar to those of trimethylboron, known to be flat. |
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| 828. |
Which of the following statement are incorrect about this molecule?A. `C_(1)-C_(2)` and `C_(3)-C_(4)` bond are of same lengthB. `C_(1)-C_(2)` bond is shorter than `C_(3)-C_(4)` bondC. `C_(1)-C_(2)` bond is longer than `C_(3)-C_(4)` bondD. `C_(1)-C_(2)` and is `C_(2)-C_(3)` bonds are of same length |
| Answer» Correct Answer - A::C::D | |
| 829. |
Which of the following compounds will create electron at ortho and para greater than A. B. C. D. |
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Answer» Correct Answer - A::B::C `-CH_(3),-OH` and `-NH_(2)` are electron donating group so, they increase electron density at ortho and para position. |
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| 830. |
The IUPAC name of A. 3-Cyclopropyl-3-ethyl -2- propeneB. 1-Cyclopropyl-1-ethyl propeneC. 3-Cyclopropyl-2-penteneD. (1-ethyl-1-propenyl)cyclopropane |
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Answer» Correct Answer - C |
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| 831. |
The systematic name of `(CH_(3))_(2)CH-COOH`A. 2-Propanoic acidB. Isobutanoic acidC. 2-Methylpropanoic acidD. 2-Methylbutanoic acid |
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Answer» Correct Answer - C |
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| 832. |
IUPAC name of `CH_(3)CH_(2)CH_(2)COCH_(3)` isA. 2-pentanoneB. Pentan-2-oneC. pentanone-2D. all the above |
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Answer» Correct Answer - D |
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| 833. |
Arrange in order of increasing acidic strength A. `X gt Z gt Y`B. `Z gt X gt Y`C. `X gt Y gt Z`D. `Z gt X gt Y` |
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Answer» Correct Answer - A `pK_(a)` value of carboxylic group is less than `pK_(a)` of `overset(+)(N)H_(3)` in amino acid and `-overset(+)(N)H_(3)` (Z) will have comparatively less `pK_(a)` than `-overset(+)(N)H_(3)` (Y) due to -I effect of carboxylic group. We know that acidic strength is inversely proportional to `pK_(a)`. Hence, correct order of acidic strength is `-CO_(2)H_((X)) gt -overset(+)(N)H_(3(Z)) gt - overset(+)(N)H_(3(Y))` |
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| 834. |
Which of the following has shortest `C-Cl` bond?A. `CH_(3)-Cl`B. `CH_(2)=CH-Cl`C. D. `CH_(2)=CH-CH=CH-Cl` |
| Answer» Correct Answer - C | |
| 835. |
Which of the following molecules has the shortest carbon-carbon single bond length ?A. `CH_(2)=CH-C-CH`B. `CH_(2)=CH-C-=N`C. `CH_(2)=CH-CH-O`D. `CH_(2)=CH-CH=CH_(2)` |
| Answer» Correct Answer - B | |
| 836. |
The presence of the chlorine atom on benzene ring makes the second substituent enter at a positionA. OrthoB. MetaC. ParaD. Ortho-para |
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Answer» Correct Answer - D Chlorine atom is ortho-para directing group. |
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| 837. |
The number of C-C sigma bonds in the compound A. 16B. 14C. 18D. 11 |
| Answer» Correct Answer - B | |
| 838. |
Orbital interaction ( partial overlapping ) between the sigma bonds of a substituent group and a neighbouring pi orbital is known asA. HyperconjugationB. Inductive effectC. Steric effectD. Dipole-dipole interactions |
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Answer» Correct Answer - A It is hyperconjugation process. |
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| 839. |
Which of the following `sigma` bonds participate in hyperconjugation ? A. I and IIB. I and VC. II and VD. III and IV |
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Answer» Correct Answer - B `porp` H atoms w.r.t.C=C bond take in hyperconjugattion |
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| 840. |
Allyl cyanide contains `sigma` and `pi`-bonds:A. `9 sigma, 3pi`B. `9 sigma, 9pi`C. `3 sigma, 4pi`D. `5 sigma, 7pi` |
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Answer» Correct Answer - A `underset("Allyl cyanide")(overset(darr 2 sigma)(CH_(2))underset(pi)overset(sigma)(=)overset(darr sigma)(CH)underset(sigma)(-)overset(darr 2sigma)(CH_(2))underset(sigma)(-)Cunderset(-)underset(pi)overset(pi)overset(-)overset(sigma)(-)N)` Total `9 sigma` bond and `3 pi` bond. |
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| 841. |
The number of sigma and pi-bonds in 1-butene-3-yne areA. 5 sigma and 5piB. 67sigma and 3 piC. 8 sigma and 2 piD. 6 sigma and 4 pi |
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Answer» Correct Answer - B `underset("1-butene, 3-yne")(H underset(sigma)-overset(H)overset(| sigma)(C)underset(pi)overset(sigma)=overset(H)overset(|sigma)(C)overset(sigma)-Cunderset(2pi)overset(sigma)-=C overset(sigma)-H) sigma` -bond = 7, `pi` = bonds = 3 |
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| 842. |
Rank the hydrogen atoms `(H_(a),H_(b), H_(c))` present in the following molecule is decreasing order of their acidic strengh. A. `agtbgtc`B. `bgtagtc`C. `bgtcgta`D. `cgtbgta` |
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Answer» Correct Answer - D Acidic strenght `prop` stability of resulting anion . (i.e,conjugate base) |
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| 843. |
The acidity of the protons `H^(+)` in the following is : `(I) CH_(3)CH_(2)overset(O)overset(||)C Cunderset(-)(H_(3)` `(II)CH_(3)CH_(2)Ooverset(O)overset(||)C Cunderset(-)(H_(3)` `(III)CH_(3)CH_(2)Ooverset(O)overset(||)C Cunderset(-)(H_(2))overset(O)overset(||)COCH_(2)CH_(3)`A. `IgtIIgtIII`B. `IgtIIIgtII`C. `IIgtIgtIII`D. `IIIgtIgtII` |
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Answer» Correct Answer - D Compound (III) is active methylene compound. So it is highly acidic. |
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| 844. |
`CH_(3)-overset(O)overset(||)Cunderset(a)-Ounderset(b)-CH_(3),` The correct relation between the bond lengths a and b is :A. `a=b`B. `bgta`C. `blta`D. Impossible to predict |
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Answer» Correct Answer - B `CH_(3)-overset(O^(delta-))overset(||)C=overset(delta+)O-CH_(3)` due to resonace this bond has double bond characters |
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| 845. |
Arrange the following in the increasing order of their basicities. (I) `p-`Toluidine (II) `N,N-`Dimethyl-p-toluidine (III) `p-`Nitroaniline` (IV) Aniline. |
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Answer» `III lt IV lt I lt II` or `II gt IV gt III` (II) (`+I` effect of two `Me` groups of `N` atom and `Me` group ar `p` position (`+ I` and `H.C` effects) (highest basic). (I) `+ I` and `H.C` effects of `(Me)` group at `p` position. (IV) (Standard)(Aniline) (III) `-I` and `-R` effect of `(-NO_2)` group at `p` position. |
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| 846. |
Among the given molecules, identify aromatic, anti-aromatic and non-aromatic molecules. |
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Answer» Correct Answer - Arromatic - 3,4,5,12,13,16,16,17,19,22,24,25,27,28,29,31,32,33,34,35,3738,39,40,41,42,43,44,45,46,47,48,49,50,51,53,54,56,57,58,61,62,63,66, Non-aromatic- 1,6,7,18,20,23,30,40,55,64,65, Anti-aromatic- 2,10,11,14,21,36,52,59,60 |
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| 847. |
Identify the compound which is not aromatic :A. B. C. D. |
| Answer» Correct Answer - D | |
| 848. |
Which of the following is false for order of `-l` effect :A. `-Fgt-Clgt-Brgt-l`B. `-C-=CHgt-CH=CH_(2)gt-CH_(2)-CH_(3)`C. `-C-=CNgt-underset(O)underset(||)C-OH`D. `-Phgt-C-=CH` |
| Answer» Correct Answer - D | |
| 849. |
In which of the following `C=C` bond length is minimum?A. B. C. D. |
| Answer» Correct Answer - B | |
| 850. |
Compare `C-N` bond length in the following : A. `IgtIIgtIII`B. `IgtIIIgtII`C. `IIIgtIIgtI`D. `IIIgtIIgtI` |
| Answer» Correct Answer - A | |