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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 possess acidic hydrogenA. `C_(2)H_(6)`B. `C_(2)H_(4)`C. `C_(2)H_(2)`D. `CH_(4)` |
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Answer» Correct Answer - C |
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| 102. |
Structural formula for lewisite isA. `ClCH=CHAsCl_3`B. `ClCH=CHAsCl`C. `ClCH=CHAsCl_2`D. `CH_2=CHAsCl_2` |
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Answer» Correct Answer - C `CH-=CH+AsCl_3tounderset("Lewisite")(ClCH-=CHAsCl_2)` |
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| 103. |
`2-`Hexyne gives trans `-2-` hexene on treatment with `:`A. `Li//NH_(3)`B. `Pd//BaSO_(4)`C. `LiAlH_(4)`D. `Pt//H_(2)` |
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Answer» Correct Answer - A |
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| 104. |
`underset(heat)overset((CH_(3))_(3)COK^(+),DMSO)to` Identify the product.A. B. C. `H-C-=C-H`D. |
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Answer» Correct Answer - D |
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| 105. |
How 3-hexyne can be prepared form acetylene? |
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Answer» Acetylene is treated with sodium metal to get disodium acetylide which on treatment with ethylbromide, 3-hyxyne is formed `HC-=CH+2NatoNaC-=Cnaoverset(2C_(2)H_(5)Br)toCH_(3)CH_(2)C-=C CH_(2)CH_(3)+2NaBr` |
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| 106. |
Product (A) isA. `H_(2)C=CH-CH=CH_(2)`B. `C H_(3)-C-=C-CH_(3)`C. `CH_(3)-CH_(2)-C-=CH`D. `CH_(3)-CH=C=CH_(2)` |
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Answer» Correct Answer - B |
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| 107. |
Acidic hydrogen is present in:A. (a) EthyneB. (b) EtheneC. (c) BenzeneD. (d) Ethane |
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Answer» Correct Answer - A H atom attached to sp-C atom is more acidic than `sp^2-C` atom, which in turn is more acidic than the one attached to `sp^3-C` atom. |
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| 108. |
Acidic hydrogen is present in:A. EthyneB. EthaneC. BenzeneD. Ethene |
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Answer» Correct Answer - A |
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| 109. |
From which one of the following can both ethylene and acetylene be prepared in a single step reaction?A. `CH_3CH_2OH`B. `BrCH_2CH_2Br`C. `CH_3CH_2Br`D. `BrCH_2CH_2OH` |
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Answer» Correct Answer - B Ethylene is obtained through dehalogenation while acetylene is obtained thorough a double dehydrohalogenation. `CH-=CHunderset((2)" "H_(2)//H^(+))overset((1)" "NaNH_(2)//("excess"))larrBrCH_(2)CH_(2)Brunderset(CH_(3)OH,Delta)overset(Zn)toCH_(2)=CH_(2)` |
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| 110. |
Ethylene can be separated from acetylene by passing the maxiture throughA. `(Br_2)/(C Cl_4)`B. alk. `KMnO_4`C. ammoniacal `Cu_2Cl_2`D. charcoal powder |
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Answer» Correct Answer - C `CH-=Choverset(Cu(H_3)_2^(+)OH^(-))toCuC-=CCu` `CH_2=CH_2overset(Cu(NH_3)_2^(+)OH^(-))to` No reaction |
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| 111. |
Product (K) of the above reaction is:A. B. C. D. |
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Answer» Correct Answer - B |
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| 112. |
, This conversion can be achieved by:A. `NaNH_(2),CH_(2)CHO`B. `NaCH_(2),CH_(3)-CH_(2)-CH_(2)-Br`C. `KOH,CH_(3)-CH_(2)-Br`D. `KOH,CH_(2)Br-CH_(2)Br` |
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Answer» Correct Answer - B |
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| 113. |
`Ph-C-=Choverset(MeO^(-))underset(MeOH)(to)` Major product of the reaction is:A. `Ph-CH=CH_(2)`B. `PhCH-CH(OM e)`C. `Ph-C-=C-OM e`D. `Ph-C(OM e)=CH_(2)` |
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Answer» Correct Answer - B |
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| 114. |
Which of the following hydrocarbons is used for the major industrual synthesis of acetylene?A. `CH_4`B. `C_2H_6`C. `C_2H_4`D. `CH_2` |
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Answer» Correct Answer - A `2CH_4overset(1500^@)toC_2H_2+3H_2` The reaction proceeds (although it is highly endothermic) because there are twice as many moles of products (4 mol) as reactants (2 mol). This cause a significant increase in entropy and at this high temperature, the `TDeltaS` term in the equation `DeltaG=DeltaH-TDeltaS` predominates, makin `DeltaG` negative even though `DeltaH` is positive. The optimum time for this reaction is a mere 0.01s because if kept too long at this temperature `C_2H_2` (an endothermic compound) would decompose. |
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| 115. |
1,2-Dichloroethane is heated with KOH (1 mol) in ethanol The major product formed isA. ethylene glycolB. acetyleneC. 2-chloroethanolD. vinyl chloride |
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Answer» Correct Answer - D `ClCH_2-CH_2Clunderset(KOH)overset(alc.)toCH_2=CH-Cl`: for further dehydrohalogenation we need another 1 mol of alcoholic KOH. |
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| 116. |
Which of the following compounds on heating with zinc powder in alcohol finally gives ethyne?A. 1,2,2,2-TetrabromoethaneB. 1,1,2,2-TetrabromoethaneC. 1,1-dibromoethaneD. 1,2-Dibromoethane |
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Answer» Correct Answer - B `{:(CHBr_(2),),(|,),(CHBr_(2),):}+2Znoverset(CH_(3)OH)to2ZnBr_(2)+CH-=CH` |
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| 117. |
Terminal alkyne is very weak acid, it forms salt with very strong base such as `NaNH_(2)` and sodium metal. `R-C-=C-Hunderset(NH_(3)(l))overset(NaNH_(2))toR-C-=overset(ө)(C)overset(o+)(N)a+(1)/(2)H_(2)` Sodium salt of alkyne is known as shown alkynide. sodium alkynide is hydrolysed with water because it is salt. Sodium salt behaves as nucleophile as well as strong base. for P-alkyl halides it behaves as a cucleophile. thus primary alkylhalides gives SN reaction halids it behaves as strong base hence they undergo elimination reaction. Q. `R-CH_(2)-C=ClIunderset(NH_(3)(l))overset(Na)toPoverset(CH_(3)-CH_(2)Br)toR`. R isA. `R-C-=C-CH_(2)-CH_(2)-CH_(3)`B. `R-CH_(2)-CH_(2)-C-=C-CH_(3)`C. `R-CH_(2)-C-=C-CH_(2)-CH_(3)`D. `R-CH_(2)-CH_(2)-CH_(2)-C-=CH` |
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Answer» Correct Answer - C |
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| 118. |
`Ph-overset(Cl)overset(|)underset(Cl)underset(|)(C)-CH_(3)overset(3NaNH_(2))(to)underset("product")((A))` , Product (A) is :A. `Ph-CH=CH_(2)`B. `Ph-C-=CH`C. `Ph-CH_(2)-CH_(3)`D. `Ph-C-=overset((-))(C)overset(o+)(N)a` |
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Answer» Correct Answer - D |
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| 119. |
Which of the following reacts with ammonical `AgNO_(3)` solution.A. EthyneB. EthyneC. But-2-yneD. Ethane |
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Answer» Correct Answer - A |
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| 120. |
Product (B) isA. B. C. D. |
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Answer» Correct Answer - C |
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| 121. |
The Products of the following I and II sequences are related as: A. DiastereomersB. IdenticalC. EnentiomersD. Geometricl isomers. |
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Answer» Correct Answer - B |
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| 122. |
In how many wayts can the structure for the alkyne with molecular formula `C_5H_8` be constucted? Strategy: First arrange five carbon atoms with a continuous C chain and then four C atoms with a side chain. Introduce the triple bond at different locations. |
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Answer» (i). `overset(5)(C)H_(3)overset(4)(C)H_(2)overset(3)(C)H_(2)-overset(2)(C)-=overset(1)(C)H`, pent-1-yne (ii). `overset(5)(C)H_(3)overset(4)(C)H_(2)-overset(3)(C)-=overset(2)(C)-overset(1)(C)H_(3)`, pent-2-yne (iii). `H_(3)overset(4)(C)-underset(CH_(3))underset(|)(overset(3)(C))-overset(2)(C)-=overset(1)(C)H`, 3-methylbut-1-yne Strutures (i) and (ii) are position isomers while strutures (i) and (iii) or (ii) and (iii) are chain isomers. Strutures (ii) and (iii) exhibit chain as well as positionn isomerism. Note that skeleton with two side chains is not possible here because the central C atom would then have 6 bonds which is not possible: `C-underset(C)underset(|)overset(C)overset(|)(C)-=C` (not possible) |
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| 123. |
Write the structure and IUPAC names of all posible structural isomeric alkynes corresponding to `C_6H_(10)`. What type of strutural isomerism is exhibited by different pairs of isomers? Strategy: First explore all the possibilities of placing the triple bond for the straight chain skeleton, followed by that for the branched chain skeleton with one side chain, and finally for the branched chain skeleton with two side chains. |
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Answer» Stage I: `C-C-C-C-C-C` (i). `underset("Hex-1-yne")(CH_(3)CH_(2)CH_(2)CH_(2)C-=CH)` (ii). `underset("Hex-2-yne")(CH_(3)CH_(2)CH_(2)C-=CH-CH_(3))` (iii). `underset("Hex-3-yne")(CH_(3)CH_(2)C-=C CH_(2)CH_(3))` Stage II: `C-C-overset(C)overset(|)(C)-C-C` (iv). `underset("3-Methylpent-1-yne")(HC-=C-underset(CH_(3))underset(|)(C)H-CH_(2)-CH_(3))` Stage III: `C-C-C-overset(C)overset(|)(C)-C` (v). `underset("4-Methylpent-1-yne")(HC-=C-CH_(2)-underset(CH_(3))underset(|)(C)H-CH_(3))` ltbr. (vi). `underset("4-Methylpent-2-yne")(CH_(3)-C-=C-underset(CH_(3))underset(|)(C)H-CH_(3))` Stage IV: `C-C-underset(C)underset(|)overset(C)overset(|)(C)-C` (vii). `underset("3,3-Dimethylbut-1-yne")(HC-=C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3)` Different pairs exhibit position and chain isomerism. For example, (i) and (ii) are position isomers (i) and (iv) are chain isomers, etc. |
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| 124. |
Predict the product of the following reaction sequence:Ethyne `overset("(1) Excess " NaNH_(2))underset({:((2) "excess" 1-CH_(2)-(CH_(2))_(2)-CH_(3)),((3) H^(o+)):})to`A. 6-iodo-1-hexyneB. 1-hexyneC. 5-decyneD. 1-iodo-1-hexene |
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Answer» Correct Answer - C |
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| 125. |
What is the major poduct expected from the following reaction?A. `CH_(3)-underset(Cl)underset(|)(C)=CH_(2)`B. C. `CH_(3)-CH_(2)-underset(Cl)underset(|)overset(Cl)overset(|)(C)-H`D. `CH_(3)-underset(Cl)underset(|)overset(Cl)overset(|)(C)-CH_(3)` |
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Answer» Correct Answer - D |
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| 126. |
What is the major product expected from the following reaction? `CH_(3)-C-=C-CH_(3)underset("low pressure poisoned catalyst")overset(D_(2)" one mole")to`A. B. C. D. `CD_(3)-underset(D)underset(|)overset(D)overset(|)(C)-underset(D)underset(|)overset(D)overset(|)(C)-CD_(3)` |
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Answer» Correct Answer - B |
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| 127. |
In its reaction with silver nitrate acetylene showsA. Oxidizing propertyB. Reducing propertyC. Basic natureD. Acidic nature. |
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Answer» Correct Answer - D |
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| 128. |
1-butyne on reaction with hot alkaline `KMnO_(4)` gives:A. `CH_(3)CH_(2)CH_(2)COOH`B. `CH_(3)COOH+CH_(3)COOH`C. `CH_(3)COOH` onlyD. `CH_(3)CH_(2)COOH+HCOOH` |
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Answer» Correct Answer - D |
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| 129. |
The intermediate species formed in the above reaction is:A. B. C. D. |
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Answer» Correct Answer - D BuLi is a very strong base, it abstracts proton from propargyl position as well as from the terminal position to give dianion (d) as an intermediate species. |
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| 130. |
What is the final product, C, of the following reaction sequence? `CH_(3)-CH_(2)-C-=C-Hunderset((ii).CH_(3)CH_(2)Br)overset((i)NaNH_(2))toA` `Aoverset(Na,NH_(3)(liq.))toB` `Bunderset(CH_(2)Cl_(2))overset(Br_(2))toC`A. B. C. D. |
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Answer» Correct Answer - A |
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| 131. |
Q. `C_(3)H_(2)O_(2)underset(KMnO_(4))overset("Hot alkaline")to`Product. One of the products isA. `underset(CHO)overset(CHO)(|)`B. `underset(COOH)overset(COOH)(|)`C. `O=CH-CH_(2)-COOH`D. `CH_(3)-underset(O)underset(||)(C)-COOH` |
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Answer» Correct Answer - B |
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| 132. |
Predict the products of following reactions: A. A is `Ph-CH_(2)-CH_(2)-CH_(2)-CH_(3)`B. B is `Ph-CH=CH-CH=CH_(2)`C. A is `Ph-CH=CH-CH=CH_(2)`D. B is `Ph-CH_(2)-CH_(2)-CH=CH_(2)` |
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Answer» Correct Answer - A::B |
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| 133. |
What is the major product expected from the following reaction `CH_(3)-C-=C-Hunderset(NH_(3))overset(NaNH_(2))to`A. `CH_(3)-C-=overset(ө)(CN)overset(o+)(a)`B. `H-C-=C-overset(ө)(C)H_(2)Noverset(o+)(a)`C. `CH_(3)-overset(NH_(2))overset(|)(C)=CH_(2)`D. `H_(2)N-CH_(2)-C-=C-H` |
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Answer» Correct Answer - A |
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| 134. |
Which reaction yields the major product shown?A. B. C. D. |
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Answer» Correct Answer - B |
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| 135. |
Major product:A. `Ph-overset(I)overset(|)(C)-CH-I`B. `Ph-overset(I)overset(|)(C)H-CH_(2)-I`C. `Ph-C-=C-I`D. `I-C-=C-I` |
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Answer» Correct Answer - C |
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| 136. |
`HO-CH_(2)-CH_(2)-C-=CH underset(CH_(3)-CH_(2)-X)overset(1eqoverset(odot)(NH_(2)))to`A. `CH_(3)-CH_(2)-O-CH_(2)-CH_(2)-C-=CH`B. `HO-CH_(2)-CH_(2)-C-=C-CH_(2)-CH_(3)`C. `CH_(3)-CH_(2)-OCH_(2)-CH_(2)-C-=C-CH_(2)-CH_(3)`D. All the above |
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Answer» Correct Answer - A |
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| 137. |
Compound (A) does not react with Tollens or Grignard reagent, but after treatment with `NaNH_2`, it gives the above test. The compound (A) is/are:A. (a) `Me--=-Me`B. C. D. (d) `Ph--=-Me` |
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Answer» Correct Answer - A::C::D Internal alkyne on reaction with `NaNH_2` isomerises to terminal alkyne, which gives all the tests mentioned. Here (a), (c) and (d) are internal alkynes. |
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| 138. |
Which reagent will be used for the above conversion?A. `Na//Liq.NH_(3)`B. `H_(2),Pd-CaCO_(3)`C. `Li,Ph-NH_(2)`D. `H_(2),Pt` |
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Answer» Correct Answer - B |
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| 139. |
Which of the following is cummulative diene?A. `H_(2)C=C=CH_(2)`B. `H_(2)C=CH-CH_(2)-CH=CH_(2)`C. `H_(2)C=CH-CH=CH_(2)`D. All of these |
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Answer» Correct Answer - A |
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| 140. |
Arrange the compounds (1),(2) and (3) in their decreasing order of stability: `underset((1))(H_(2)C=C=CH_(2))` `underset((2))(H_(2)C=CH-CH_(2)-CH=CH_(2))` `underset((3))(H_(2)C=CH-CH=CH_(2))`A. 1gt2gt3B. 2gt3gt1C. 3gt1gt2D. 3gt2gt1 |
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Answer» Correct Answer - D |
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| 141. |
The reagent(s) for the following conversion is/are:A. alcoholic KOHB. alcoholic KOH followed by `NaNH_(2)`C. aqueous KOH followed by `NaNH_(2)`D. `Zn//CH_(3)OH` |
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Answer» Correct Answer - B |
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| 142. |
Which is the most suitable reagent among the following distinguish comound (3) from the others? (1) `CH_(3)C-=C-CH_(3)` (2) `CH_(3)CH_(2)-CH_(2)-CH_(3)` (3) `CH_(3)CH_(2)C-=CH` (4) `CH_(3)CH=CH_(2)`A. `Br_(2)` in `C Cl_(4)`B. `Br_(2)` in `CH_(3)COOH`C. Alk. `KMnO_(4)`D. `AgNO_(3)//NH_(4)OH` |
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Answer» Correct Answer - D |
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| 143. |
Which of the most suitable reagent amog the following to distinguish compound (III) from the rest of the compound (I). `CH_(3)-C-=C-CH_(3)` (II). `CH_(2)-CH_(2)-CH_(2)-CH_(3)` (III). `CH_(3)-CH_(2)-C-=CH` (IV). `CH_(3)-CH=CH_(2)`A. `Br_(2)` in `C Cl_(4)`B. cold aq Alk `KMnO_(4)`C. Ammonical `AgNO_(3)` solutionD. All of these |
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Answer» Correct Answer - C |
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| 144. |
A compound on dehydrohalogenatio with alcoholic KOH gives alkyne but on dehalogenation with zinc dust gives alkene. The compoundA. `C_(2)H_(5)Br`B. `CH_(3)CHBr_(2)`C. `CH_(2)Br-CH_(2)Br`D. `CHBr_(2)-CHBr_(2)` |
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Answer» Correct Answer - C |
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| 145. |
Which of the following compounds possess the same general formula as alkynes? (i) Dienes (ii) Cycloalknes (iii) Bicyclics (iv) Spiro compoundsA. (i),(ii)B. (i),(ii),(iii)C. (i),(ii),(iii),(iv)D. (i),(iii) |
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Answer» Correct Answer - C All have the same general formula `C_nH(2n-2)` |
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| 146. |
`Bu-C=CHoverset(NaNH_(2)rarrAoverset(Ph-CHO)underset(H_(2)O)rarroverset(MnO_(2))rarrC` Compound C of the reaction cannot be:A. B. C. D. |
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Answer» Correct Answer - A::B::C |
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| 147. |
`H_(3)C-C-=Choverset(NaNH_(2))toXunderset(H_(2)O)overset("Acetone")toYunderset(Delta)overset(Conc.H_(2)SO_(4))toZ`:A. X is `H_(3)C-CH=CH-CH_(3)`B. X is `H_(3)C-C-=C^((-))Na^((+))`C. Y is `H_(3)C-C-=C-underset(CH_(3))underset(|)overset(OH)overset(|)(C)-CH_(3)`D. Z is `H_(3)C-C-=C-underset(CH_(3))underset(|)(C)=CH_(2)` |
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Answer» Correct Answer - B::C::D |
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| 148. |
Which of the following reactions are ot feasible?A. `HC-=CH+KOHto`B. `HC-=CH+NaNH_(2)to`C. `HC-=CH+NaOHto`D. `HC-=overset((-))(C)K^((+))+(CH_(3))_(3)C-Brto` |
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Answer» Correct Answer - A::C |
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| 149. |
`CH-=CHoverset(NaNH_(2))to[A]overset(CH_(3)Br)to[B]`A. `CH_(2)=CH-CH=CH_(2)`B. `HC-=C-CH_(3)`C. `CH_(2)=CH-CH_(3)`D. `CH_(3)-CH_(2)-CH_(3)` |
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Answer» Correct Answer - B |
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| 150. |
Which of the reaction is not feasible?A. `HC-=CNa+CH_3OHto`B. `HC-=CH+CH_3Lito`C. `HC-=CH+NaHto`D. `HC-=CH+NaCNto` |
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Answer» Correct Answer - D These are acid-base reactions. Acid-base reactions always go from the stronger acids and bases to the weaker ones. Therefore, actylene (an acid) will only react with bases that are converted to acids weaker than acetylene, and acetylide ion (a base) will only react with acids that are converted to bases weaker than acetylide ion: `HCNgtCH_3OHgtC_2H_2gtH_2=CH_4` `underset("Stronger base")(HC-=CNa)+underset("Stronger acid")(CH_3OH)tounderset("weaker acid")(CH-=CH)+underset("Weaker base")(CH_3ONa)` `underset("Stronger acid")(HC-=CH)+underset("Stronger base")(CH_3Li)tounderset("Weaker base")(HC-=CLi)+underset("Weaker acid")(CH_4)` `underset("Stronger acid")(HC-=CH)+underset("stronger base")(NaH)tounderset("Weaker base")(HC-=CNa)+underset("Weaker acid")(H_2)` `HC-=CH+NaCNto` No reaction. HCN is a stronger acid than acetylene, thus, weaker acid acetylene cannot displace stronger acid HCN from its salt. |
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