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The observed rotation of 10ml of a solut...

The observed rotation of 10ml of a solution containing 2g of a compound when placed in 25cm long polarimeter tube is +`13.4^@`. What is the specific rotation of the compound?

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`alpha_(obs ) = + 13.4^@ " " C = (2g )/(10 cm^3) = 0.2 g cm ^(-3)`
` I=(25 )/(10) dm = 2.5 dm `
Specific rotation, ` alpha = ( + 13.4 )/( 0.2 xx 2.5 ) = + 26.8 ^@`
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AAKASH SERIES-ALKYL AND ARYL HALIDES-OBJECTIVE EXERCISE - 4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS)
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  3. (A) Pure chloroform does not give precipitate with AgNO3 solution. (...

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  5. (A) Thionyl chloride reacts with primary alcohols to form pure alkyl h...

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  6. (A) The boiling points of alkyl halides decrease in the order RI > RBr...

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  7. (A) KCN reacts with methyl chloride to give methyl cyanide and methyl ...

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  8. (A) In monohaloarenes, further electrophilic substitution occurs at or...

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  9. (A) Benzonitrile is prepared by the action of chlorobenzene with KCN ...

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  10. (A) Styrene on reaction with HBr gives 1-bromo-1-phenyl ethane. (R) ...

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  11. (A) NBS is a specific reagent for allylic bromination (R) Allylic br...

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  13. (A) 2-Bromobutane on reaction with sodium ethoxide in ethanol gives 1-...

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  14. (A) Chloral reacts with phenyl chloride to form DDT (R) It is an ele...

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  16. (A) Addition of HBr on but-2-ene gives two structural isomeric product...

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  17. (A) The nature of the solvent can influence the rotation of plane pola...

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  18. (A) SN2 reactions are exothermic (R) SN2 reactions are thermochemica...

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  19. (A) Chloroform can be used as general anaesthetic. (R) In presence o...

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