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In the representation of specific rotati...

In the representation of specific rotation `([alpha]_(D)^(250C))`, .D. indicates

A

Dextro rotation

B

Configuration of -OH group

C

Configuration of `-NH_2` group

D

Wave length of light

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The correct Answer is:
D
Wave length of light
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For an optically active compound specific rotation ([alpha]_(D)^(25)) depends on a) Length of the polarimeter tube b)Concentration of solution c) Polarimeter instrument d) Nature of the compound

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D(+) Glucose has melting point 140^(@)C and specific rotation [a]_(D)^(25) is 112^(@)C . Another D(+) Glucose has melting point 150^(@)C and specific rotation [a]_(D)^(25) is +18.7^(@)C . The two form have significantly different optical rotation but when an aqueous solution of either form is allowed to stand, it rotation changes. The specific rotation of one form decreases and rotation of other increases until both solution show the same value +52.7^(@) . The change in rotation towards an equilibrium value is called mutarotation [alpha]_(D)^(25) = +18.7^(@)C " " [alpha]_(D)^(25) = +112^(@)C For mannose the mutarotation can be shown in brief as follow

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Freshly prepared a-D-glucose solution has specific rotation +111^(@) and after sometime it becomes

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AAKASH SERIES-ISOMERISM -PRACTICE SHEET (EXERCISE-III) STRAIGHT OBJECTIVE TYPE QUESTIONS)
  1. In the representation of specific rotation ([alpha](D)^(250C)), .D. in...

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  2. A molecule as a whole is asymmetric if it does not possess

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  3. For an optically active compound specific rotation ([alpha](D)^(25)) d...

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  4. Which of the following exists in enantiomeric pair

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  5. When two or more isotopic atoms are connected to the asymmetric chiral...

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  6. (A): Meso tartaric acid is optically inactive (R): Meso tartaric aci...

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  7. (+-) Lactic acid is optically inactive due to

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  8. If the specific rotation produced by the compound ‘A’is +52^(@), the...

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  9. The incorrect statement about

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  10. The pair of structures given below represent

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  11. Which of the following statements is not correct regarding enantiomers...

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  12. Which of the following can show optical isomerism

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  13. 2, 3-pentadiene is optically active since it

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  14. How many chiral carbon atoms are present in 2, 3, 4 -trichoropentane?

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  15. How many isomers could be obtained by replacing one hydrogen of propen...

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  16. For an optically active compound alpha(obs) depends on

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  17. Which statement is incorrect about diastereomers

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  18. If a compound has ‘n’ different types of asymmetric carbon atoms then ...

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  19. For tartaric acid total number of possible stereo isomers (configurati...

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  20. Total number of possible isomers (configuartional only ) for 2,3,4- tr...

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