InterviewSolution
Saved Bookmarks
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.
| 151. |
`rArr` Arrange the following nitrogen containing compounds in decreasing order of basicity (Question No.126-130). A. `PgtQgtRgtS`B. `QgtPgtRgtS`C. `QgtPgtSgtR`D. `SgtPgtQgtR` |
|
Answer» Correct Answer - B Q is most basic as it is aliphatic amine, P is more basic than R and S as `lp e^(-)` of P is delocalise. |
|
| 152. |
`rArr` Among the following compounds which is strongest acid (Question No.134-139).A. B. C. D. |
|
Answer» Correct Answer - B `Ph-underset(O)underset(||)overset(O)overset(||)S-OHoverset(-H^(o+))rarrPh-underset(O)underset(||)overset(O)overset(||)S-overset(Ɵ)O` (Resonance stabilise) |
|
| 153. |
`rArr` The decreasing order of basicity of following aniline derivatives is (Question No.109-117). A. `XgtYgtZ`B. `YgtZgtX`C. `ZgtYgtX`D. `XgtZgtY` |
|
Answer» Correct Answer - C `+I` power increases basicity. |
|
| 154. |
Which is more basic than hydroxide `(OH^(-))` ion ?A. `CH_(3)-NH_(2)`B. `CH_(3)-CH_(2)-O^(-)`C. `F^(-)`D. `Ph-NH_(2)` |
| Answer» Correct Answer - B | |
| 155. |
Which is the following is the strongest acid ?A. 3,5-dinitrophenolB. 2,4-dinitrophenolC. phenolD. 2,4,6-trinitrophenol |
| Answer» Correct Answer - D | |
| 156. |
The least stable free radical isA. `CH_(3)overset(*)(C)H_(2)`B. `CH_(3)CH_(2)overset(*)(C)H_(2)`C. `(CH_(3))_(2)overset(*)(C)H`D. `overset(*)(C)H_(3)` |
|
Answer» Correct Answer - D `overset(*)(C)H_(3)` is least stabel due to absence of hyper conjugation and +I effect. |
|
| 157. |
The most unstable carbocation is:A. `Ch_(3)underset(o+)CH_(2)`B. `Cl-CH_(2)-overset(o+)CH_(2)`C. `overset(o+)CH_(2)-CHO`D. `overset(o+)CH_(2)-O-CH_(3)` |
| Answer» Correct Answer - C | |
| 158. |
Which free radical is the most stable-A. `C_(6)H_(5)-overset(.)(C)H_(2)`B. `CH_(2)=CH-Coverset(.)(H_(2))`C. `CH_(3)-Coverset(.)(H)-CH_(3)`D. `CH_(3)-underset(CH_(3))underset(|)(overset(.)(C))-CH_(3)` |
| Answer» Correct Answer - A | |
| 159. |
Increase order of acidic strength of given compounds is : A. `IIIltIltIVltII`B. `IIltIltIVltIII`C. `IltIIIltIVltII`D. `IltIIIltIItIV` |
|
Answer» Correct Answer - A Acidic stregth `prop-I,-H,-Mprop(1)/(+I,+H,+R)` |
|
| 160. |
Least stable radical among the following is :A. B. C. D. |
| Answer» Correct Answer - C | |
| 161. |
Give the stability order of following radicals :A. `III gt IV gt II gt I`B. `IV gt III gt II gt I`C. `I gt II gt III gt IV`D. `IV gt II gt III gt I` |
| Answer» Correct Answer - B | |
| 162. |
Most stable radical among the following is :A. B. C. D. |
| Answer» Correct Answer - C | |
| 163. |
Which compound has the highest value of `pK_(a)` ?A. `CI-CH_(2)-CH_(2)-COOH`B. `CH_(3)-CH_(2)-COOH`C. `CH_(3)-underset(CI)underset(|)CH-COOH`D. `CH_(3)-underset(CI)underset(|)overset(CI)overset(|)C-COOH` |
|
Answer» Correct Answer - B Acidic stength `prop-Iprop(1)/(+I)` |
|
| 164. |
Increase order of acidic strength of given compounds is : A. `IIIltIltIVltII`B. `IIltIltIVltIII`C. `IltIIIltIVltII`D. `IltIIIltIItIV` |
|
Answer» Correct Answer - A Acidic stregth `prop-I,-H,-Mprop(1)/(+I,+H,+R)` |
|
| 165. |
The compound which is not resonance stabilisedA. `CH_(2)=CH-Cl`B. C. `CH_(2)=CH-CH_(2)Cl`D. |
| Answer» Correct Answer - C | |
| 166. |
`rArr`The decreasing order of stability of following cation is (Question No.56-60). A. `PgtQgtRgtS`B. `QgtSgtRgtP`C. `QgtPgtSgtR`D. `QgtPgtRgtS` |
|
Answer» Correct Answer - D `+M` or `+R` effect operate at ortho and para position and it increases stability more than `+I` group. `-M` or `-R` effect operate at ortho and para position and it decreases stability of cation more than `-I` groups. `+I` and `-I` effect operate at all position but it is distance dependent. |
|
| 167. |
Arrange the following radicals in decreasing order of their stability. A. `IV gt I gt III gt II`B. `IV gt III gt II gt I`C. `I gt II gt III gt IV`D. `IV gt III gt I gt II` |
| Answer» Correct Answer - B | |
| 168. |
with the prodcut :A. `CO_(2)`B. C. bothD. none of these |
|
Answer» Correct Answer - A `Ph-COOH+NaHoverset(*)CO_(3)hArrH_(2)overset(*)CO_(3)+Ph-COO^(Ө)` `underset("unstable")(H_(2))rarroverset(*)CO_(2)uarr+H_(2)O` |
|
| 169. |
Decreasing order of stability for the following radicals is : `underset((I))CH_(2)=overset(*)CH,underset((II))overset(*)CH_(2)=CH_(2),` A. `IIgtIIIgtIgtIV`B. `IIIgtIIgtIgtIV`C. `IIIgtIIgtIgtIV`D. `IgtIVgtIIgtIII` |
| Answer» Correct Answer - D | |
| 170. |
is more basic thanA. `-NO_(2)` in P is poor inductive groupB. `-NO_(2)` in P is stronger inductive groupC. `-NO_(2)` in P is stronger `-M` groupD. `-NO _(2)` in P is does not exhibit `-M` power |
|
Answer» Correct Answer - D `-NO_(2)` become out of plane. |
|
| 171. |
In the compound `CH_(3)-overset(beta_2)CH_(2)overset(o+)overset(NMe_(3)Cl^(Ɵ))overset(|)CH-overset(beta_1)CH_(3)` attack of base occur on `beta_(1)` not on `beta_(2)` :A. `beta_(2)` is sterically hinderedB. `C-H` of `beta_(1)` is more acidic than `beta_(2)`C. `beta_(1)` will form stable alkeneD. All are correct |
|
Answer» Correct Answer - B `beta_(2)` is less acidic, so attack occur on `beta_(1).` |
|
| 172. |
Which of the following structural pairs do not repersent contrbutors to resonance hybrid?A. B. C. D. |
| Answer» Correct Answer - B::C::D | |
| 173. |
In the following compound the favourable site/s for protonation is/are: A. a and eB. a and dC. b ,c and dD. a |
| Answer» Correct Answer - C | |
| 174. |
Among the following three canonical sturetures what would be their relative contribution in hybrid? `CH_(2)=CH-underset(o+)CH-CH=underset(Ɵ)CH_(2)` (I) `CH_(2)=CH-CH-CH=CH-CH_(2)` (II) `overset(o+)CH_(2)-CH=CH-CH=CH-overset(Ɵ)CH_(2)` (III)A. `IgtIIgtIII`B. `IIIgtIIgtI`C. `IgtIIIgtII`D. `IIIgtIgtII` |
|
Answer» Correct Answer - A (I) is most stabilise as it is neutral, (II) is more stabilise than (III) because of more attraction between opposite charges. |
|
| 175. |
In which of the following pairs of resonance contributors is the sturcture on the right a important contributor?A. `H-overset(o+)C=overset(* *)O:harrH-C-=overset(o+)O:`B. `overset(Ɵ)CH_(2)-overset(o+)N-=overset(* *)NharrCH_(2)=overset(o+)N=overset(Ɵ)N`C. `CH_(3)-overset(o+)CH-underset(* *)overset(* *)OHharrCH_(3)-CH=underset(* *) overset(o+)OH`D. All of the above |
| Answer» Correct Answer - D | |
| 176. |
In which of the following pairs of compounds, will second structure have more contribution to resonance hybrid than first ?A. B. C. `F-underset(NH_(2))underset(|)overset(o+)(C)-OH " & " overset(o+)(F)-underset(NH_(2))underset(|)(C)-OH`D. |
| Answer» Correct Answer - A::B::C::D | |
| 177. |
The preferred sites of protonation in the following compounds are `(I) Ph-CH_(2)-overset(1)overset(NH)overset(||)C-overset(2)overset(NH_(2))" "(II)Ph-CH_(2)-overset(3)overset(O)overset(||)C-overset(4)(N)H_(2)`A. 1 and 3B. 2 and 4C. 1 and 4D. 2 and 3 |
|
Answer» Correct Answer - A Protonation at site 1 and 3 is supported by resonance stabilization. |
|
| 178. |
Which of the following resonance strutuers is the major contributor to the resonance hybrid ? `CH_(3)-CH_(2)underset((I))(-)overset(o+)(CH)-underset(* *)overset(* *)(O)Me hArr CH_(3)-CH_(2)underset((II))(-)CH=underset(* *)overset(o+)(O) Me`A. IB. IIC. Both have equal contrbutionD. They are not resonance structures |
|
Answer» Correct Answer - B Each atom has complete octer in structure (II) |
|
| 179. |
Which of the followig pairs has higher resonance energy: (a). (b). `CH_(2)=CH-O-CH=CH_(2)&CH_(2)=CH-NH-CH=CH_(2)` (c). `CH_(2)=CH-overset(Theta)(N)H&NH=CH-overset(Theta)(N)H` |
|
Answer» Correct Answer - (a)I,(b)II,(c)II (a). In `I^(st)` part-aromaticity (b). In `II^(nd)` part-In case of nitrogen electron availability is more. (c). Negative charge distribute on more electronegative species. |
|
| 180. |
Which of the following pairs has higher resonance energy: (a). `CH_(3)COOH & CH_(3)COONa` (b). `CH_(2)=CH-overset(Theta)(O)&CH_(2)=CH-OH` |
|
Answer» Correct Answer - (a)II,(b)I (a). `CH_(3)-overset(O)overset(||)(C)-overset(ɵ)(O)overset(o+)(N)a` lone pair easily available for resonance. (b). In 1st part 1.p. easily available. |
|
| 181. |
Which bond is more polar in the following pairs of molecules ? (a) `H_3C-H,H_3C-Br`, (b) `H_3C-NH_2,H_3C-OH` ( c) `H_3C-OH,H_3C-SH`. |
|
Answer» (a) `H_3C-Br`, since `Br` is more `EN` than `H`. (b) `H_3 C-OH`, since `O` is more `EN` than `N` ( c) `H_3C-OH`, since `O` is more `EN` than `S`. |
|
| 182. |
Isopentane can form four structually isomeric mono bromo derivatives. How many of them are optically active?A. 1B. 2C. 3D. 4 |
|
Answer» Correct Answer - 2 `ClCH_(2)-overset(**)CH(CH_(3))-CH_(2)-CH_(3)` `CH_(3)-overset(**)CH(Cl)-CH(CH_(3))-CH_(3)` |
|
| 183. |
Match the column `{:("Column I","Column II"),((A)." Sucrose",(P)." "alpha-D" Glucose"),((B)." Maltose",(Q)." "beta-"Fructose"),((C)." Lactose",(R)." "beta-D-"Glucose"),(,(S)." "beta-D-"Galactose"):}` |
| Answer» Correct Answer - A::B::C | |
| 184. |
Same osazone derivative is obtained in case of D-golucose, D-Mannose and D-fructose due toA. the same configuration at C-5B. The same constitutionC. The same constitution at C-1 and C-2D. The same constitution and same configuration at `C-3,C-4,C-5` and `C-6` but different constitution and configuration at `C-1` and `C-2` which becomes identical by osazone formation |
|
Answer» Correct Answer - D Same osazone derivative is obtained in case of D-glucose, D-mannose & D-fructose due to same constitution & same configuration at `C-3,C-4,C-5` & `C-6` but different constitution & configuration at `C-1 & C-2` which becomes identical by osazone formation |
|
| 185. |
Mutarotation involvesA. RacemisationB. DiastereomerisationC. Optical resolutionD. Conformational inversion |
|
Answer» Correct Answer - B Mutarotation involes diasteromerisation |
|
| 186. |
Match the column `{:(underset(("Carbohydrates"))("Column I"),underset(("Type"))("Column II")),((A)." Glucose",(P)." Monosaccharide"),((B)." Sucrose",(Q)." Oligosaccharide"),((C)." Maltose",(R)." Polysaccharide"),((D)." Glycogen",):}` |
| Answer» Correct Answer - A::B::C::D | |
| 187. |
Match the column `{:(underset(("Carbohydrate"))"Column I",underset(("Properties"))"Column II"),((A)." Starch",(P)." Mutarotation"),((B)." Sucrose",(Q)." Non reducing sugar"),((C)." Lactose",(R)." "beta-"glycosidic bond"),((D)." Maltose",(S)." "alpha-"glycosidic bond"),(,(T)." Reducing sugar"),(,(U)." Hemiacetal"):}` |
| Answer» Correct Answer - A::B::C::D | |
| 188. |
Hyperconjugation involves delocalization ofA. `sigma` electrons into an adjacent `pi` bondB. `n` electron of a heteroatom into an adjacent multiple bondC. `pi` electrons into an adjacent `pi` bondD. All of these |
|
Answer» Correct Answer - A Hyperconjugation, an extension of the resonance effect, involves `sigma, pi` conjugation. |
|
| 189. |
Which of the following have `+M` effect (`overline e` - donating mesomeric effect) ?A. `-NO`B. `-COOH`C. `-NH_2`D. `-SR` |
| Answer» Correct Answer - C::D | |
| 190. |
Mesomeric effect involves delocalization of `:`A. ProtonB. Sigma electronsC. Pi electronsD. None of these |
|
Answer» Correct Answer - C The mesomeric effect refers to the polarity produced in a molecules as a result of interaction between two `pi -` bonds or a `pi`-bond and a lone pair of electrons. |
|
| 191. |
Which of the following have `-M` effect (`overline e` - withdrawing mesomeric effect) ?A. B. `- SO_3H`C. `-OR`D. `-Br` |
|
Answer» Correct Answer - A::B (a,b) Here `(a)` and `(b)` do not have `LP overline e^, s`, but `( c)` and `(d)` have `-ddotunderset(..)OR,-ddotunderset(..)Br:` |
|
| 192. |
Relative stabilities of the following carbocations will be in the order `{:(overset(o+)(C)H_(3),CH_(3)overset(o+)(CH_(2)),overset(o+)(C)H_(2)OCH_(3),),((i)," "(ii)," "(iii),):}`A. `(iii) gt (ii) gt (i)`B. `(iii) lt (ii) lt (i)`C. `(ii) gt (iii) gt (i)`D. `(iii) gt (i) gt (ii)` |
|
Answer» Correct Answer - A The dispersal of the charge stabilizes the carbocation. More the number of alkyl groups, the greater the dispersal of positive charge and there fore, more the stability of carbocation, thus `overset(+)(C_(2))H_(5) gt overset(+)(C)H_(3). -OCH_(3)` is an electron donating group, thus it will increases the stability of carbocation, hence the expected order is, `(iii) gt (ii) gt (i)`. |
|
| 193. |
Which of the following is not a permissible resonating form?A. `H_(2)overset(o+)C-underset(CH_(3))underset(||)overset(* *)N-overset(Ɵ)O`B. `CH_(2)=underset(CH_(3))underset(|)overset(o+)N-overset(Ɵ)O`C. `CH_(2)=underset(CH_(3))underset(|)overset(o+)N=O`D. `overset(Ɵ)CH_(2)-underset(CH_(3))underset(|)overset(o+)N=O` |
|
Answer» Correct Answer - C Octet of N cannot accmmodate `10e^(-)` |
|
| 194. |
Which of the following structures are resonance structures ?A. B. C. D. `CH_(3)-CH=CH-CH_(3)&CH_(3)-CH_(2)-CH=CH_(2)` |
| Answer» Correct Answer - B | |
| 195. |
The most unlikely representation of resonance structures of p-nitrophenoxide ion is :A. B. C. D. |
| Answer» Correct Answer - C | |
| 196. |
Hyperconjugation observed inA. B. `overset(.)CPh_(3)`C. D. |
| Answer» Correct Answer - D | |
| 197. |
Hydrogenation of unsaturated hydrocarbons is an exothermic reaction. Due to hyperconjugation and resonance the stability of unsaturated hydrocarbons increases and the increase in stability is more due to resonance. Compound with same number of `pi-`bonds and more stability has lower heat of hydrogenation. Heat of formation is defined as the energy evolved when a molecule is formed from its atoms. For isomers the more stable compounds has higher heat of formation. The order of heat of formation of the following molecules is : A. `IgtIIgtIIIgtIV`B. `IIgtIIIgtIVgtI`C. `IVgtIIgtIIIgtI`D. `IVgtIIIgtIIgtI` |
| Answer» Correct Answer - C | |
| 198. |
Amongst the given structures , which are permissible resonance forms ?A. `overset(+)(C)H-underset(CH_(3))underset(|)(N)-underset(..)overset(..)(O)^(-)`B. `CH_(2)=underset(CH_(3))underset(|)(N)=underset(..)(O: )`C. `CH_(2)=underset(CH_(3))underset(|)overset(+)(N)-overset(..)underset(..)(O: )`D. `overset(-)( :C)H_(3)-underset(CH_(3))underset(|)overset(+)(N)=underset(..)(O: )` |
|
Answer» Correct Answer - B The structure shown in (b) has 10 electrons surrounding nitrogen, but the octet rule limits nitrogens to 8 electrons. |
|
| 199. |
Hydrogenation of unsaturated hydrocarbons is an exothermic reaction. Due to hyperconjugation and resonance the stability of unsaturated hydrocarbons increases and the increase in stability is more due to resonance. Compound with same number of `pi-`bonds and more stability has lower heat of hydrogenation. Heat of formation is defined as the energy evolved when a molecule is formed from its atoms. For isomers the more stable compounds has higher heat of formation. The correct heat of hydrogenation order is : (p) 1,3-Pentadiene (q) 1,3-Butadiene (r) 2,3-Dimethyl-1,3-butadiene (s) PropadieneA. p gt q gt r gt sB. s gt q gt p gt rC. q gt s gt p gt rD. s gt p gt q gt r |
| Answer» Correct Answer - B | |
| 200. |
Designate the species (A) and (B) as electrophile ( E) or nucleophile (Nu) in the following reactions : (a) `BEt_(3) +Me_(2)ddotO:rarrMe_(2)overset(o+)underset(..)(O)-overset(Theta)BEt_(3)` (b) `CH_(2) =O +underset("Bisulphite ion")( :overset(Theta)SO_(3)Hrarr)underset(O^(Theta))underset(|)(CH_(2))-SO_(3)H` ( c) `C_2H_5C1 + :CH:^(Ө) rarrC_2H_5 -CN + C1^(Ө)` (d) ( e) `CH_(3)-overset(o+)(CH)-underset(CI)underset(|)(CH_(2)) +CI^(Theta) rarr CH_(3) -underset(CI)underset(|)(CH)-underset(CI)underset(|)(CH_(2))` (f) `:underset(..)overset(o+)NH_(2) +CH_(3)-C-=CH rarr CH_(3)-C -= C^(ddotTheta) +NH_(3)` |
| Answer» `{:(Reaction, (a),(b),(c),(d),(e),(f)),(Species A,E,E,E,Nu,E,Nu),(Species B,Nu,Nu,Nu,E,Nu,E):}`. | |