InterviewSolution
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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.
| 201. |
Hyperconjugation is best decribe as:A. Delocalisation of `pi` electrons into a near by empty orbital.B. Delocalisation of `sigma` electrons into a near by empty orbial.C. The effect of alkyl groups donating a small amount of electron density inductively into a carbocationD. The migration of a carbon or hydrogen from one carbocation to another. |
| Answer» Correct Answer - B | |
| 202. |
Which one of the following will be the most easiliy attacked by an electrophile?A. B. C. D. |
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Answer» Correct Answer - B Due to mesomeric effect (+) of -OH group the electron density ob benzene ring increase. So the electrophile easily attacked on these electron rich center. |
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| 203. |
Due to the presence of an unpaired electron, free radicals are:A. Chemically reactiveB. Chemically inactiveC. AnionsD. Cations |
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Answer» Correct Answer - A Fre radicals are very reactive due to the presence of free `e^(-)`. |
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| 204. |
Ortho effect is special type of effect that is shown by o-subsituents .This ortho-effect operates at the benzoic acids irrespective of the polar type. Nearly all o-substituted benzoic acid are stronger than benzoic acid. Benzoic acid is a resonance stabilised and so the carboxyl group is coplaner with the ring. An o-subsituent tends to prevent this coplanarity. What is the order of `K_(a)` of following compounds ? A. `I gt II gt III gt IV gt V`B. `II gt I gt III gt IV gt V`C. `V gt VI gt III gt I gt II`D. `III gt II gt I gt V gt IV` |
| Answer» Correct Answer - A | |
| 205. |
The species responsible for nitration isA. `NO_(2)^(+)`B. `NO_(3)`C. `NO_(2)`D. All the above |
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Answer» Correct Answer - A The nitration takes place in presence of `H_(2)SO_(4).H_(2)SO_(4)` is responsible for the generation of nitronium ion `(NO_(2)^(+))` which is responsible for nitration. `HNO_(3)+2H_(2)SO_(4) rarr H_(2)O^(+) + underset("nitronium ion")(NO_(2)^(+))` |
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| 206. |
Which is not considered as electrophileA. `-overset(+)(N)H_(4)`B. `-H^(+)`C. `-Cl^(+)`D. `-overset(+)(N)O_(2)` |
| Answer» Correct Answer - A | |
| 207. |
Which of the following species is an electrophile?A. `NH_(3)`B. `OH^(-)`C. `CH_(4)`D. `SO_(3)` |
| Answer» Correct Answer - D | |
| 208. |
An electrophile among the following is-A. `NH_(3)`B. `CH_(3)NH_(2)`C. `H_(2)O`D. `AlCl_(3)` |
| Answer» Correct Answer - D | |
| 209. |
Reaction intermdiates are short lived species and are highly reactive. They are formed by heterolytic and homolytic bond fission. There are various types of reaction intermediates in which the most important are carbocation , carbanion and free radical. Carbocation is an organic species in which carbon have positive charge and six electrons in its outermost shell. The stability of carbocation can be increased by positive inductive effect, hyperconjugation and delocalisation. If `alpha`-atom with respect to carbocation has one or more lone pair of electron then lone pair of electron strongly stabilises the carbocation due to octet completion. Species in which carbon have negative charge is called carbanion. Carbanion carries three bond pairs and one lone pair. The stability of carbanion can be increased by negative inductive effect, negative mesomeric effect and delocalisation. Free radical is a species which have seven electrons in its outermost shell. The stability of free radical can be increased by hyperconjugation and delocalisation. The stability order of following carbocations is A. `I gt II gt III`B. `II gt I gt III`C. `III gt I gt II`D. `II gt III gt I` |
| Answer» Correct Answer - A | |
| 210. |
Reaction intermdiates are short lived species and are highly reactive. They are formed by heterolytic and homolytic bond fission. There are various types of reaction intermediates in which the most important are carbocation , carbanion and free radical. Carbocation is an organic species in which carbon have positive charge and six electrons in its outermost shell. The stability of carbocation can be increased by positive inductive effect, hyperconjugation and delocalisation. If `alpha`-atom with respect to carbocation has one or more lone pair of electron then lone pair of electron strongly stabilises the carbocation due to octet completion. Species in which carbon have negative charge is called carbanion. Carbanion carries three bond pairs and one lone pair. The stability of carbanion can be increased by negative inductive effect, negative mesomeric effect and delocalisation. Free radical is a species which have seven electrons in its outermost shell. The stability of free radical can be increased by hyperconjugation and delocalisation. The stability order of following free radicals is: `C_(6)H_(5)underset(I)CH_(2)overset(*)CH_(2)" "CH_(3)underset(II)CH_(2)overset(*)CH_(2)" "underset(" "III)(C_(6)H_(5))overset(*)CH_(2)" "underset(IV)(CH_(3)^(*)`A. `I gt II gt III gt IV`B. `II gt III gt I gt IV`C. `I gt III gt II gt IV`D. `III gt II gt I gt IV` |
| Answer» Correct Answer - D | |
| 211. |
Reaction intermdiates are short lived species and are highly reactive. They are formed by heterolytic and homolytic bond fission. There are various types of reaction intermediates in which the most important are carbocation , carbanion and free radical. Carbocation is an organic species in which carbon have positive charge and six electrons in its outermost shell. The stability of carbocation can be increased by positive inductive effect, hyperconjugation and delocalisation. If `alpha`-atom with respect to carbocation has one or more lone pair of electron then lone pair of electron strongly stabilises the carbocation due to octet completion. Species in which carbon have negative charge is called carbanion. Carbanion carries three bond pairs and one lone pair. The stability of carbanion can be increased by negative inductive effect, negative mesomeric effect and delocalisation. Free radical is a species which have seven electrons in its outermost shell. The stability of free radical can be increased by hyperconjugation and delocalisation. Which of the following is the most stable carbanion intermediate ?A. B. C. D. |
| Answer» Correct Answer - D | |
| 212. |
Which of the following is an electrophile ?A. `H_(2)O`B. `NH_(3)`C. `AlCl_(3)`D. `C_(2)H_(5)NH_(2)` |
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Answer» Correct Answer - C Electrophile always contains an electron of deficient atom. `AlCl_(3)` is an electrophile because the octlet of `Al` is not complete. It has only `6e^(-)s` in the valence shell. |
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| 213. |
Assertion : Aniline is better nucleophile than aniline ion. Reason : Aniline ion have +ve charge.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 - A It is fact that aniline is better nucleophile than anilium ion. Anilium ion contain +ve charge, which reduces the tendency to donate lone pair of electron `underset("Anilium ion")(C_(6)H_(5)NH_(3)^(+))`. Therefore, both assertion and reason are true. |
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| 214. |
An organic reaction occurs by using reagents called electrophiles and nucleophiles via the formation of some reactive intermediates called carbocations, carbanions, free radicals, carbenes, nitrenes, radical cations, and radical anions. Which of the following contains nucleophiles only ?A. `PH_3, ROH, CH_2= CH_2`B. `SnF_4, BeF_2, NH_3`C. `Cr^(3 +), overset (Ө) N H_2, H_2 O`D. `: C C1_2, I^(Ө), H^(Ө)` |
| Answer» Correct Answer - A | |
| 215. |
An organic reaction occurs by using reagents called electrophiles and nucleophiles via the formation of some reactive intermediates called carbocations, carbanions, free radicals, carbenes, nitrenes, radical cations, and radical anions. Which of the following contains electrophiles only ?A. `Br^(oplus), PH_3, H_2O`B. `NO_2^(oplus), : CBr_2, SO_3`C. `NH_3,H_2 O, A1 Br_3`D. `A1C1_3, CH_2=CH_2,SO_3` |
| Answer» Correct Answer - B | |
| 216. |
Which of the following intermediates have the complete octet around the carbon atom?A. Carbonium ionB. Carbanion ionC. Free radicalD. Carbene |
| Answer» Correct Answer - A | |
| 217. |
Which is a stronger base towards a proton `overset (Ө) P H _2` or `overset (Ө) NH_2` ? |
| Answer» Bond energy `(N-N gt P-H)` (due to bond length, size of `N lt P`). Therefore, `overset (Ө) N H_2` has a strong tendency to accept proton. Hence, `overset (Ө) N H_2` is a stronger base than `overset (Ө) P H_2`. | |
| 218. |
The increasing order of `pK_b` value of the following is : (I) `HC -= C^(Ө)` `H^(Ө)` `overset (Ө) NH_2` (IV) `C overset (Ө) H_3`.A. `IV lt III lt II lt I`B. `I lt II lt III lt IV`C. `IV lt II lt III lt I`D. `I lt III lt II lt IV` |
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Answer» Correct Answer - A (a) Acidity : `HC -= H_2 gt NH_3 gt CH_4` Basicity : `HC -= C^(Ө) lt overset (Ө) H lt overset (Ө) N H_2 lt C overset (Ө) H_3` The lower the value of `pK_b`, the stronger is the base. The decreasing order of `pK_b` values : `C overset (Ө) H lt overset (Ө)N H_2 lt H^(Ө) lt HC -= C^(Ө) (IV lt III lt II lt I)`. |
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| 219. |
The correct order of decreasing basicity of the compounds is : `F_(3)C-underset(CF_(3))underset(|)N-CF_(3)` A. `IgtIIgtIIIgtIV`B. `IIIgtIIgtIVgtI`C. `IIgtIVgtIIIgtI`D. `IVgtIIIgtIIgtI` |
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Answer» Correct Answer - B (III) is most basic, (I) is least basic because o f strong `(-I)` effect. |
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| 220. |
Which of the following compounds can react with base to form salt?A. B. C. D. |
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Answer» Correct Answer - C c is most acidic. |
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| 221. |
Most acidic hydrogen is present in:A. B. C. `(CH_(3)CO)_(3)CH`D. `(CH_(3))_(3)COH` |
| Answer» Correct Answer - C | |
| 222. |
Which one of the following acids would you expect to be the strongest?A. `I-CH_(2)COOH`B. `Cl-CH_(2)COOH`C. `Br-CH_(2)COOH`D. `F-CH_(2)COOH` |
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Answer» Correct Answer - D Halogens exert `-I` effect. The greater the `-I` effect, the stronger is the acid. The decreasing order of `I`-effect of halogens is `-F gt Cl gt Br gt I`. |
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| 223. |
The pKa values for the three acidic group P,Q,R are 4.3, 9.7 and 2.2 respectively, Calculate the isoelectric point of the amino acid? |
| Answer» Correct Answer - 3.25 | |
| 224. |
The order of acidity of the H-atoms underlined in the following compounds is in the order: A. `IV gt II gt I gt III`B. `II gt IV gt III gt I`C. `III gt IV gt I gt II`D. `I gt III gt II gt IV` |
| Answer» Correct Answer - A | |
| 225. |
Number of initial centre in maltose are______. |
| Answer» Correct Answer - 10 | |
| 226. |
Number of `1^(@)` and `2^(@)` alcoholic group ini sucrose and x and y value of x & y is |
| Answer» Correct Answer - 3&5 | |
| 227. |
(X) `(C_(6)H_(3)CIBrCOOH)` are a dihalosubstituted benzoic acids. The strongest acid among all isomers is -A. B. C. D. |
| Answer» Correct Answer - B | |
| 228. |
The number of primary alcoholic isomers for `C_(4)H_(10)O` isA. 2B. 3C. 4D. 5 |
| Answer» Correct Answer - A | |
| 229. |
Primary, secondary and teritaru amines areA. Chain isomersB. Position isomersC. Functional isomersD. Tautomers |
| Answer» Correct Answer - C | |
| 230. |
Which of the following classes or organicn compounds show metamerism?A. ethersB. Secondary aminesC. ketonesD. All the three |
| Answer» Correct Answer - D | |
| 231. |
Polarisation of electrons in acrolein may be written asA. `overset(-delta)(CH_(2))=CH-CH=O`B. `overset(-delta)(CH_(2))=CH-CH=overset(+delta)(O)`C. `overset(-delta)(CH_(2))=overset(+delta)(CH)-CH=O`D. `overset(+delta)(CH_(2)) = CH - CH = overset(-delta)(O)` |
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Answer» Correct Answer - D Oxygen is highly electronegative than carbon, so it acquires partially negative charge and carbon atom acquire partially positive charge which is transferred to the last carbon atom. |
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| 232. |
Polarisation of electrons in acrolein cannot be written as :A. `overset(8-)CH_(2)=CH-overset(8+)C=O`B. `overset(8-)CH_(2)=CH-CH=overset(8+)O`C. `overset(8-)CH_(2)=overset(8+)CH-CH=O`D. `overset(8+)CH_(2)=CH-CH=overset(8-)O` |
| Answer» Correct Answer - A::B::C | |
| 233. |
Polarisation of electrons in acrolein may be written as :A. `overset (-delta) CH_2 = CH - overset (+delta)C = O`B. `overset (-delta) CH_2 = CH - CH = overset (+delta) O`C. `overset (-delta)CH_2 = overset(+delta)CH - CH = O`D. `overset (-delta)CH_2 = CH - CH = overset (-delta)O` |
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Answer» Correct Answer - D (d) `O` atom is more `EN` than `C` atom, so it acquires `(-delta)` charge and `C` atom acquires `(+ delta)` charge which is transferred to the last `C` atom. |
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| 234. |
Which of the following compounds is isomeric with trimethyl amine?A. 1-PropanamineB. 2-PropanamineC. Both 1 and 2D. 2-Burtanamine |
| Answer» Correct Answer - C | |
| 235. |
Which of the following compounds is not aromatic ?A. B. C. D. |
| Answer» Correct Answer - A | |
| 236. |
Which type of isomerism is shown by propanal and propanoneA. Functional groupB. MetamerismC. TautomerismD. Chain isomerism |
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Answer» Correct Answer - A When two compounds have similar molecular formula but differ in the functional group then the isomerism is called functional group isomerism i.e. `CH_(3)CH_(2)CHO` and `CH_(3)overset(O)overset(||)(C)CH_(3)` |
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| 237. |
Among the following compound that is not aromaticA. B. C. D. |
| Answer» Correct Answer - D | |
| 238. |
Inductive effect is a polarisation of aA. sigma bondB. `pi`-bondC. co-ordinate bondD. conjugated system. |
| Answer» Correct Answer - A | |
| 239. |
Diethyl ether is not associated with which one of these isomersA. Butanoic acidB. Methyl propionateC. StereoisomerismD. All of these |
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Answer» Correct Answer - D (a) `CH_(3)CH_(2)CH_(2)COOH(C_(4)H_(8)O_(2))` (b) `CH_(3)CH_(2)-COOCH_(3)(C_(4)H_(8)O_(2))` Diethyl ether `C_(2)H_(5)-O-C_(2)H_(5)` have position isomer and not stereoisomer. |
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| 240. |
The correct stability order of the following resonanating structures is : `underset("(I)")(CH_(2)=C=O)" "underset("(II)")(C_(3)overset(-)C-overset(+)C=O)" "underset("(III)")(H_(2)C=overset(+)C-overset(-)O)" "underset("(IV)")(H_(2)overset(-)C-C-=overset(+)O)`A. `(IV)gt(I)gt(III)gt(II)`B. `(II)gt(IV)gt(I)gt(III)`C. `(III)gt(II)gt(IV)gt(I)`D. `(I)gt(IV)gt(III)gt(II)` |
| Answer» Correct Answer - D | |
| 241. |
Which compound (s) out of the following is/are not aromatic ? A. (B)B. (B), (C) and (D)C. (C) & (D)D. (A) & (D) |
| Answer» Correct Answer - B | |
| 242. |
Which of the following pairs of structures is not a pair of resonating structures?A. `H-C-=overset(o+)NHandH-overset(o+)C=overset(* *)N-H`B. `CH_(3)-CH=CH-CH_(3)and CH_(3)CH_(2)=CH_(2)`C. `CH_(3)-underset(O)underset(|)C=CH-underset(O)underset(||)C-CH_(3)andCH_(3)-underset(O)underset(||)C-overset(Ɵ)CH-underset(O)underset(||)O-CH_(3)`D. |
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Answer» Correct Answer - B They are isomers. |
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| 243. |
Match the resonance energies 67, 88 and 121 kJ `"mol"^(-1)` for the following compounds. A. I - 67, II - 121, III- 88B. I - 121, II-67, III-88C. I-67, II-88, III-121D. I-121, II-88, III-67 |
| Answer» Correct Answer - C | |
| 244. |
Identity the aromatic compound from the following.A. B. C. D. |
| Answer» Correct Answer - A | |
| 245. |
Which one of the following conformation of cyclohexane is chiralA. Twist boatB. RigidC. ChairD. Boat |
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Answer» Correct Answer - A Twisted boat is chiral as it does not have plane of symmetry. |
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| 246. |
Select the correct option related to stability of following structures.A. B. C. D. `H-overset(O)overset(||)(C)-overset(Θ)(O)gt CF_(3) - overset(O)overset(||)(C)-overset(Θ)(O)` |
| Answer» Correct Answer - C | |
| 247. |
The pair of resonanating structures among the following isA. `R_(2)CH-N=O" "R_(2)C=N-OH`B. C. D. |
| Answer» Correct Answer - B | |
| 248. |
Consider the following representation They areA. EnantiomersB. DiastereomersC. Conformational isomersD. Identical |
| Answer» Correct Answer - D | |
| 249. |
Consider the structures given below They areA. EnantiomersB. DiastereoisomersC. Geometrical isomersD. Homomers |
| Answer» Correct Answer - A | |
| 250. |
How many structural isomers are possible for a compound with molecular formula `C_(3)H_(7)Cl`A. 2B. 5C. 7D. 9 |
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Answer» Correct Answer - A Two isomers `CH_(3)-underset(Cl)(CH)-CH_(3)` and `CH_(3)-CH_(2)-CH_(2)Cl` are possible for `C_(3)H_(7)Cl`. |
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