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.
| 101. |
Which of the following molecules have non-zero dipole moments ? (I) Gauche conformation of 1, 2 -dibromoethane (II) Anti conformation 1,2-dibromorthane (III) Trans-1,4 -dibromocyclohexane `(IV) Cis-1, 4-dibromocyclohexane (V) Tetrabromomethane (VI) DibromocychexaneA. I and IIB. I and IVC. II and IVD. I,IV and Vi |
| Answer» Correct Answer - D | |
| 102. |
Which of the following can shown tautomerism?A. HCNB. `CH_(3)CN`C. `CH_(3)NO_(2)`D. `CH_(3)ONO` |
| Answer» Correct Answer - a,b,c | |
| 103. |
Total stereoisomer of the compound Cortisone is :A. 32B. 64C. 66D. 128 |
| Answer» Correct Answer - b | |
| 104. |
Which of the following compunds are resolvable?A. B. Cl-CH=C=C=C=CH-BrC. D. |
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Answer» Correct Answer - a,c,d (a) Resolvable (b) Non-resolvable (c ) Resolvable (d) Resolvable |
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| 105. |
Which of the following compunds show tautomerism?A. `NH_(2)-overset(O)overset(||)C-NH_(2)`B. `NH_(2)-overset(S)overset(||)C-NH_(2)`C. D. `CH_(3)-overset(O)overset(||)C-CH_(3)` |
| Answer» Correct Answer - a,b,c,d | |
| 106. |
A sample of optically active alochol has a specific ratation, `[alpha]_(D)^(25)`, equal to `+1.51^(@)`. a. What is the percentage enantiomeric excess of the sample? b. Which enantiomer is in excess, `(R ) or (S)`? |
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Answer» a. Enantiomeric excess `= ("Observed rotation")/("Specific rotation of pure enantiomer")xx100` `=(+1.151^(@))/(+5.756^(@))xx100= 20.00%` b. Since the (R ) enantiomer is `(+)`-from, it is present in excess |
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| 107. |
(+)-2 - Butanol has `[theta]_(lambda)^(25)=+13.9^(@)` A sample of 2- butanil containing both the enantiomers.The percentage of the (+) and (-) enantiomer in the sample are respectively :A. 37.4 % and 62.6 %B. 62.5% and 37.4%C. 42.2 % and 75.8 %D. 35.5% and 64.5% |
| Answer» Correct Answer - A | |
| 108. |
Calculate enantiomeric axcees of mixture containing 6g of (+) 2-butanol and 4g of (-) 2-butanol.A. 0.1B. 0.2C. 0.4D. 0.33 |
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Answer» Correct Answer - b Optical purity or enantiomeric excess `=("Exess of one enantiomer")/("Total mixture")xx100` Enantiomeric exess (e.e.) `=(6g-4g)/(6+4)xx100=20%` |
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| 109. |
What is the observed rotation when `0.1 M` solutions of `(R )-2` butanol is mixed with an equal volume of `0.05M` solution of recemic `2-butnol` and the resulting solution is taken in a cell of `5cm` long tube in a polarimeter? The specific rotation of `(R -2)` butonal is `+13.9^(@)` |
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Answer» The racemic `2-` butanol has no contribution to optical activity. So the observed rotation will be due ot `(R )-2` butanol. Only Racemic butanol helps in diluting the solution. Therefore, the concentration of `(R )-2` butanol after dilution is `0.05M`. Molecular weight of `2-` butnol is `74`. `l= 5 cm= 0.5dm` `:.` Concentration `=(74xx0.05)/(1000)=3.7xx120^(-3)gm ml^(-1)` `:. [alpha]=[alpha]_(pure)xxlxxc= 13.9xx0.5xx3.7xx10^(-3)` ltbr `=0.26^(@)` |
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| 110. |
(+)- mandelic acid has a specific rotation of `158^(@)` What would be the observed specific rotation of a mixture of 25% (-)mandelic acid and 75% (+)- mandlic acid?A. `+118.5^(@)`B. `-118.5^(@)`C. `-79^(@)`D. `+79^(@)` |
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Answer» Correct Answer - d Racemic = 50%, `(+)to 50%` |
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| 111. |
In which of the following has minimum torsional strain and minimum vander wall strain. A. IB. IIC. IIID. IV |
| Answer» Correct Answer - B | |
| 112. |
Which of the following constitutional isomerism is exhibited by alkanes?A. metamerimsB. chain isomerismC. position isomersD. geometrical isomerism |
| Answer» Correct Answer - B::C | |
| 113. |
The IUPAC name of the compounds : A. (2E,4E,6Z)-octa-2,4,6-trieneB. (2E,4E,6E)-octa-2,4,6-trieneC. (2Z,4E,6Z)-octa-2,4,6-trieneD. (2Z,4Z,6Z)-octa-2,4,6-triene |
| Answer» Correct Answer - C | |
| 114. |
The `IUPAC` name of the compound with formula `C_(n)H_(2n+1)`, having the lowest possible molecular mass and capable of showing enantiomerism, is:A. `3`- Methyl hexaneB. `2,3`-Dimethyl pentaneC. MethaneD. Both (a) and (b) |
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Answer» Correct Answer - D `underset((I))underset(("2-Methyl hexane"))(H_(3)C-underset(H)underset(|)overset(.^(2)C_(2)H_(5))overset(|)(.^(3)C^(**))-C_(3)^(6)H_(7))` or `underset((II))underset("2,3-Dimethyl pentane")(H_(3)C -underset(H)underset(|)overset(overset(5)(C_(2))H_(5))overset(|)(C_(3)^(**))-underset(2)overset(CH_(3))overset(|)(CH)-underset(1)CH_(3))` Both (I) and (II) are optically active alkanes |
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| 115. |
Select the correct IUPAC name of following compounds : A. 2R,3S-3-amino-2-carbomoyl butane -1,4-dioic acidB. 2S,3R-2-amino-3-carbamoyl butane-1,4-dioic acidC. 2S,3R-3-amino-2-carbamoyl butane-1-4-dioic acidD. 2R,3R-2-amino-3-carbamoyle butane -1-4-dioic acid |
| Answer» Correct Answer - B | |
| 116. |
What charecteristic is the best common to both cis - 4 - octene and trans - 4 - octene?A. heat of hydrogenationB. melting pointC. heat of combustionD. prduct of hydrogenation |
| Answer» Correct Answer - d | |
| 117. |
The number of stereoisomer possible for the following compound : A. 2B. 4C. 6D. 8 |
| Answer» Correct Answer - a | |
| 118. |
Consider the following graph which shows heat of combustion of isomeric butenes and give answers to th given questions. Q and S are:A. Chain isomersB. Geometrical isomersC. Position isomersD. Tautomers |
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Answer» Correct Answer - a Specific rotation do not change on changing concentration and length of tube `=-12^(@).` |
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| 119. |
Consider the following graph which shwos heat of eombustions of isomeric pentenes and answer the given wuestion. Which of the followign can show geometrical isomerism ?A. UB. SC. RD. T |
| Answer» Correct Answer - d | |
| 120. |
Consider the following graph which shwos heat of eombustions of isomeric pentenes and answer the given wuestion. Which of the following pair shows chain isomerism?A. P,UB. S,RC. Q,TD. Q,R |
| Answer» Correct Answer - b | |
| 121. |
Which of the foollowing statement is correct ?A. (I) and (II) are conformational isomer while (II) and (III) are functional isomersB. (I) and (II) are functional isomers while (II) and (III) are conformational isomersC. (I) and (II) are functional isomers while (I) and (III) are conformational isomersD. None of above |
| Answer» Correct Answer - d | |
| 122. |
For compound, which statement is correctA. If (A) and (B) have same molecular formula then compound never show geometrical isomerism.B. If (A) and (B) have same molecular formula then compound always show geometrical isomerism.C. If (A) and (B) have same molecular formula then compound may or may not show geometrical isomerism.D. None of the above |
| Answer» Correct Answer - C | |
| 123. |
Statement-1: Me-C= and `Me-oversetrarrN=C` are not functional isomers. Statement-2: As in HCN cyanide and isocyanide groups are interconvetible into each other and remains in equilibium.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - d `Me-C-=N and M-Noverset(to)=C` are functional isomers but `H-C-=N and H-N=C` are tautomers. |
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| 124. |
Which of the following does not show geometrical isomerismA. B. C. D. |
| Answer» Correct Answer - C | |
| 125. |
Statement I: `Me-C-=N` and `Me -Nvec(=)C` are not functional isomers. Statement II: As in HCN cynide and isocyanide groups are iterconvertible into each other and remains equilibrium .A. If both statement-I and statement II are true & the statement II is a correct explanation of the statement IB. If both statemetn -I and Statement II are True and Statement II is not a correct explanation of the Statement IC. If Statement -I is True but the Statement -II is falseD. If Statement -I is false but the Statement -II is True. |
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Answer» Correct Answer - D [`Me-C-=N` and `Me-Nvec(=)C` are functional isomers but `H-C-=N` and `H-Nvec(=)C` are Tautomer] |
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| 126. |
Which of the following is pair of functional isomers ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 127. |
The number of optically active compounds in the isomers of `C_(4)H_(9)Br` isA. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - A One chiral carbon containing compound always optically active `underset("(2-forms)")(CH_(3)-CH_(2)-overset(B)overset(|**)(CH)-CH_(3))` `C_(4)H_(9)-Br " " underset("(inactive)")(C-C-C-C-Br)" " underset("(active)")(C-C-underset(Br)underset(|)(C)-C) " " underset("(inactive)")(C-underset(C)underset(|)(C)-C-Br) " " underset("(inactive)")(C-overset(Br)overset(|)underset(C)underset(|)(C)-C)` |
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| 128. |
Maleic acid and fumaric acid are :A. Position isomerB. geometrical isomerC. EnantiomersD. Functional isomer |
| Answer» Correct Answer - B | |
| 129. |
Metamer of compound b is A. B. C. D. |
| Answer» Correct Answer - D | |
| 130. |
Types of geometrical isomerism shown at point X , y and Z of the following compound respectively are A. `{:(X,Y,Z),(cis,cis,trans):}`B. `{:(X,Y,Z),(cis,trans,trans):}`C. `{:(X,Y,Z),(trans,cis,cis):}`D. `{:(X,Y,Z),(cis,trans,cis):}` |
| Answer» Correct Answer - A | |
| 131. |
Which of the following will not show geometrical isomerism?A. B. C. D. `CH_3CH=CHCH_2 CH_3` |
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Answer» Correct Answer - B In (b), the two groups (two `H` atoms) are same around the double bond. |
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| 132. |
Tautomer of which of the following can show geometrical isomerism?A. `CH_3-CHO`B. `CH_3CH_2-CHO`C. D. |
| Answer» Correct Answer - b,c | |
| 133. |
Tautomer in following is Diad system :A. `CH_(3)COCH_(3)`B. `CH_(3)CH_(2)NO_(2)`C. D. HCN |
| Answer» Correct Answer - D | |
| 134. |
How many chain isomers of hexane, `CH_3(CH_2)_4CH_3`, are possible ?A. fiveB. sixC. threeD. four |
| Answer» Correct Answer - D | |
| 135. |
a. The specific rotation of a pure enantiomer is `+10^(@)`. What will be its observed rotation if its is isolated from a reaction with i. `30%` racemisation and `70%` retention. ii. `70%` racemisation and `30%` inversion. b. What is the percentage composition of a mixtrue of two enantiomers whose rotation is `-10^(@)`? The specific rotation of pure enantiomers is `-20^(@)`. c. What is the optical purity of a sample having an `[alpha]_(obs.)=+9.0^(@)` if `[alpha]_(D)=+12^(@)`. |
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Answer» a. i. `[alpha]_(obs.)= 0.70xx(+10^(@))= +7.0^(@)` ii. `30%` inversion, with inversion specific rotation is `(-10^(@))`. `:. [alpha]_(obs.)=0.30 xx (-10^(@)) = -3.0^(@)` b. Optical purity `(OP)` of sample `=([alpha]_(obs.))/([alpha]_(D))` `= (-10^(@)xx100)/(-20^(@))=50%` So, `50%` of the mixtrue consists of `(-)` enantiomer and `50%` is the racemate [i.e., `25% (+)` and `25%(-)` form] Total percentage of `(-)` form `= 50%+25%=75%` Total percentage of `(+)` form `=25%` c. Optical purity `(OP)` of sample `=(+9^(@))/(+12^(@))xx100= 75%` The mixtrue has `75% (+)` and `25%` racemic mixtrue [i.e., `12.5%(+)` and `12.5%(-)` form] Total percentage of `(+)` form `=75%+(25%)/(2)= 87.5%` Total percentage of `(-)` form `=12.5%` |
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| 136. |
In which of the following the enol form is dominant over keto form?A. B. C. D. |
| Answer» Correct Answer - A::B | |
| 137. |
Correct order f keto content for following compound is : `Me_(3)C-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CM_(3)` `Me_(2)CH-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CHMe_(3)` `MeCH_(2)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CH_(2)Me`A. `RgtQgtP`B. RltQltPC. `QgtRgtP`D. `QltRltP` |
| Answer» Correct Answer - a | |
| 138. |
Select correct option :A. B. C. D. |
| Answer» Correct Answer - c | |
| 139. |
the total number of isomeric optically active monochloro derivative of isopentane isA. twoB. threeC. fourD. one |
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Answer» Correct Answer - C Isopentene `CH_(3)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(3) overset(Cl_(2)//hv) to ` Products are (I) `CH_(3)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-Cl (s) " " (II) Cl-CH_(2)-overset(H)overset(|)underset(H)underset(|)(C)-CH_(2)CH_(3) (R)` (III) `CH_(3)-underset(Cl)underset(|)(CH)-underset(CH_(3))underset(|)(CH)-CH_(3) (s) " " (IV) CH_(3)-underset(CH_(3))underset(|)(CH)-underset(Cl)underset(|)(C)HCH_(3) (R)` Only (1) and (3) are optically active. |
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| 140. |
The number of possible structural isomers of `C_4H_(10)O` isA. EightB. SixC. SevenD. Five |
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Answer» Correct Answer - C Molecular formula `C_4H_(10)O(C_nH(2n+2)O)` represents monohydric alcohol and aliphatic ethers (functional isomers). Four alcohols are possible: `CH_3CH_2CH_2CH_2OH,CH_3CH(OH)CH_2CH_3,(CH_3)CHCH_2OH`, and `(CH_3)_3COH`. Three ethers are possible: `CH_3OCH_2CH_2CH_3,CH_3OCH(CH_3)_2` and `CH_3CH_2OCH_2CH_3`. |
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| 141. |
Which of the following statements regarding `1,2`-dimethyl cyclo-pentane and `1,3`-dimethyl cyclopentane is/are correct?A. In both, cis form is meso, while trans from is resolvableB. In both, trans form is meso, while cis form is resolvableC. In both cis and trans forms are meso.D. In both, cis and trans forms are resolvable. |
| Answer» Correct Answer - A | |
| 142. |
Which of the following can sxhibit metamerism?A. `CH_3OCH_3`B. `CH_3COCH_2CH_3`C. `CH_3CH_2NHCH_2CH_3`D. `CH_3CH_2SCH_3` |
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Answer» Correct Answer - C `CH-3NHCH_2CH_2CH_3` is a metamer of `CH_3CH_2NHCH_2CH_3` |
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| 143. |
Fill 1 in OMR sheet if the eequilibrium is favorred in forward direction and fall 2 in OMR sheet if the equilibrium is favoured in backward direction for example if all the eqilibrium are favoured in forward dirtection fill 1111 as anewer, and if olny first two are favoured in forward direcftion fill 1122 in OMR sheet. |
| Answer» Correct Answer - 1222 | |
| 144. |
An `SN^(2)` reaction at an asymmetric `C` of a compound always gives:A. A enantiomer of the substrateB. A product with opposite optical rotationC. A mixtrue of diastereomersD. A single stereoisomers |
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Answer» Correct Answer - D `SN^(2)` reaction proceeds with the inversion of configuration, hence, only one stereoisomer is obtained. |
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| 145. |
Match th r following columns : |
| Answer» Correct Answer - a-p,r,s ; b-p,r ; c-p,s ;d-p | |
| 146. |
Match the following columns : |
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Answer» Correct Answer - a-q,s ; b-q,s ; c-p,s ; d-q,r (a) 2-chiral centre, one-alkene which can show geometrical isomerism. `therefore` Stereoisomerism = 8 (b) 2-chiral centre , `therefore` stereoisomer `= 2 ^(2)=4` ( c) Copound is symmetrical and has even `therefore a=2^(n-1)=2` (`alpha` = optically active compound) `m=2^(n/2-1)=1` Total steroisomer a+m=3 (d) Total chiral centre is one `thereforea=2^(1)=2` |
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| 147. |
How many structural isomer are possible for C_(4)H_(10)O` (only alcohol). |
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Answer» Correct Answer - 4 `[C_(4)H_(10)O]` (1) C-C-C-C-OH (2) `C-C-underset(OH)underset(|)C-C` (3) `C-overset(C)overset(|)C-C-OH` (4) `C-underset(OH)underset(|)overset(C)overset(|)C-C` |
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| 148. |
Which form is more stable in the shown case - A. IB. IIC. I=IID. II>I |
| Answer» Correct Answer - A | |
| 149. |
which of the following have zero dipole moment?A. Benzene 1,4 idolB. p-dichlorobenzeneC. p-phenylenediamineD. all of these |
| Answer» Correct Answer - b | |
| 150. |
The number of isomers of `C_(6)H_(14)` is:A. 4B. 5C. 8D. 6 |
| Answer» Correct Answer - B | |