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Q. No.Which of the following methods is incorrect for the synthesis of alkenes?
1. Treatment of alkynes with Na in liquid NH3
2. Heating alkyl halides with alcoholic KOH
3. Treating alkyl halides in aqueous KOH solution
4. Treating vicinal dihalides with Zn metal
1. Treatment of alkynes with Na in liquid NH3
2. Heating alkyl halides with alcoholic KOH
3. Treating alkyl halides in aqueous KOH solution
4. Treating vicinal dihalides with Zn metal
Subtopic: Chemical Properties |
78%
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Predict the order of reactivity of the following four isomers towards SN2 reaction.
(I) CH3CH2CH2CH2Cl
(II) CH3CH2CH(Cl)CH3
(III) (CH3)2CHCH2Cl
(IV) (CH3)3CCl
(I) CH3CH2CH2CH2Cl
(II) CH3CH2CH(Cl)CH3
(III) (CH3)2CHCH2Cl
(IV) (CH3)3CCl
| 1. | (IV) > (III) > (II) > (I) |
| 2. | (I) > (II) > (III) > (IV) |
| 3. | (I) > (III) > (II) > (IV) |
| 4. | (IV) > (II) > (III) > (I) |
Subtopic: Chemical Properties |
68%
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The product formed in the following reaction sequence is:
| 1. |  |
| 2. | \(CH_3-CH=CH-CH_3 \) |
| 3. | \(CH_3 -CH_2 -CH = CH_2 \) |
| 4. | \(CH_3 -CH_2 -CH_2 -CH_2 -OH \) |
Subtopic: Chemical Properties |
62%
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Subtopic: Chemical Properties |
80%
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NEET - 2022
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Identify the statement that is incorrect regarding chirality:
| 1. | A racemic mixture shows zero optical rotation |
| 2. | SN1 reaction yields a 1:1 mixture of both enantiomers |
| 3. | The product obtained by SN2 reaction of haloalkane having chirality at the reactive site shows the inversion of configuration |
| 4. | Enantiomers are superimposable mirror images on each other |
Subtopic: Chemical Properties |
77%
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NEET - 2022
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Which of the following is suitable to synthesize chlorobenzene?
| 1. |  |
| 2. | Benzene, Cl2, anhydrous FeCl3 |
| 3. | Phenol, NaNO2, HCl, CuCl |
| 4. |  |
Subtopic: Haloarenes: Directive Influence of Halogen |
69%
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The following compound would be classified as:
| 1. | Vinylic halide | 2. | Benzylic halide |
| 3. | Aryl halide | 4. | Allylic halide |
Subtopic: Introduction and Physical Properties |
69%
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The correct order for the rate of \(\alpha\) , \(\beta\)-dehydrohalogenation for the following compounds is:
(i)  |
(ii)  |
(iii)  |
| 1. | (i) < (ii) < (iii) | 2. | (ii) < (i) < (iii) |
| 3. | (iii) < (ii) < (i) | 4. | (ii) < (iii) < (i) |
Subtopic: Chemical Properties |
55%
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A reaction among the following can generate isonitriles as a major product.
A. \(R-X + HCN \rightarrow \)
B. \(R-X + AgCN \rightarrow \)
C. \(R-X + KCN \rightarrow \)
D. \(R-X + NaCN \xrightarrow [C_2H_5OH] {H_2O} \)
Choose the most appropriate answer from the options given below:
A. \(R-X + HCN \rightarrow \)
B. \(R-X + AgCN \rightarrow \)
C. \(R-X + KCN \rightarrow \)
D. \(R-X + NaCN \xrightarrow [C_2H_5OH] {H_2O} \)
Choose the most appropriate answer from the options given below:
| 1. | (D) only | 2. | (C) and (D) only |
| 3. | (B) only | 4. | (A) and (B) only |
Subtopic: Chemical Properties |
76%
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Subtopic: Chemical Properties |
58%
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