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प्रश्न
Racemisation occurs in ______.
विकल्प
SN1 reaction
SN2 reaction
Neither SN1 nor SN2 reaction
SN2 reaction as well as SN1 reaction
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उत्तर
Racemisation occurs in SN1 reaction.
Explanation:
A mixture containing two enantiomers in equal quantities will have zero optical rotation because the rotation caused by one isomer will be neutralised by the rotation caused by the other isomer. This type of mixture is known as a racemic mixture or racemic modification. Racemisation refers to the process of converting an enantiomer into a racemic mixture. Both retented and inverted products are generated during the SN1 reaction. Racemization happens as a result of the production of both d- and l- products.
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संबंधित प्रश्न
Given reasons: C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH3–Cl.
How will you bring about the following conversion?
Toluene to benzyl alcohol
Arrange the compounds of the following set in order of reactivity towards SN2 displacement:
2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane
Identify 'A' in the following reaction -
(a) 2- Bromo-2 methylbutane
(b) 1 -Bromo-2,2-dimethylpropane
(c) 1 - Bromo - 3 -methylbutane
(d) 1 - Bromo- 2 -methylpropane
Which of the following pairs is/are correctly matched?
| Reaction | Product | |
| I | RX + AgCN | RNC |
| II | RX + KCN | RCN |
| III | RX + KNO2 | \[\begin{array}{cc} \phantom{.......}\ce{O}\\ \phantom{.....}/\\ \ce{R - N}\phantom{....}\\ \phantom{.....}\backslash\backslash\\ \phantom{.......}\ce{O} \end{array}\] |
| IV | RX + AgNO2 | \[\ce{R-O-N=O}\] |
Which among MeX, RCH2X, R2CHX and R3CX is most reactive towards SN2 reaction?
Compound ‘A’ with molecular formula \[\ce{C4H9Br}\] is treated with aq. \[\ce{KOH}\] solution. The rate of this reaction depends upon the concentration of the compound ‘A’ only. When another optically active isomer ‘B’ of this compound was treated with aq. \[\ce{KOH}\] solution, the rate of reaction was found to be dependent on concentration of compound and \[\ce{KOH}\] both.
(i) Write down the structural formula of both compounds ‘A’ and ‘B’.
(ii) Out of these two compounds, which one will be converted to the product with inverted configuration.
How do polar solvents help in the first step in SN1 mechanism?
Optical activity of an enantiomeric mixture is +12.6° and the specific rotation of (+) isomer is +30°. The optical purity is ______ %.
Inversion of configuration occurs in ______.
