Home
Class 11
CHEMISTRY
The optical rotation of a solution of pu...

The optical rotation of a solution of pure natural camphor is found to be `+5.76^(@)` under the following conditions, concentration = 0.13g/ml, length of polarimeter = 1dm, wavelength = sodium D line, `T=25^(@)C`. The specific rotation of camphor is

A

`+44.3^@`

B

`+26.7^@`

C

`-26.7^@`

D

`-44.3^@`

Text Solution

Verified by Experts

The correct Answer is:
A

`[alpha]` = specific rotation of comphor
`((alpha) " = Observed angle of rotation" (theta))/(c xx 1)`
` = (+576)/(0.13 xx 1) = + 44.3^@`
Promotional Banner

Topper's Solved these Questions

  • ISOMERISM

    AAKASH SERIES|Exercise ADDITIONAL PRACTICE EXERCISE (LEVEL-II LECTURE SHEET (ADVANCED) MORE THAN ONE CORRECT ANSWER TYPE QUESTIONS)|11 Videos
  • ISOMERISM

    AAKASH SERIES|Exercise ADDITIONAL PRACTICE EXERCISE (LEVEL-II LECTURE SHEET (ADVANCED) LINKED COMPREHENSION TYPE QUESTIONS)|6 Videos
  • ISOMERISM

    AAKASH SERIES|Exercise PRACTICE SHEET ((LEVEL-II) INTEGER TYPE QUESTIONS)|4 Videos
  • IONIC EQUILIBRIUM

    AAKASH SERIES|Exercise ADDITIONAL PRACTICE EXERCISE (LEVEL -II PRACTICE SHEET (ADVANCED) (Integer Type Questions))|8 Videos
  • PERIODIC CLASSIFICATION

    AAKASH SERIES|Exercise OBJECTIVE EXERCISE - 3 (RECENT AIPMT/NEET QUESTIONS)|14 Videos

Similar Questions

Explore conceptually related problems

The concentration of an organic compound in chloroform is 6,15 g per 100 mL of solution. A portion of this solution in a 5 cm polarimeter tube causes an observed rotation of - 1.2^(@) . What is the specific rotation of the compound?

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?

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 What percentage of beta-D-(+) glucopyranose found at equilibrium in the aqueous solution?

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

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

For a dilute solution containing 2.5 g of non-electroyte solute in 100g of water , the elevation in boiling point at 1 atm pressure is 2^(@)C . Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (mm of Hg) of the solution is (take K_(b)=0.76 "mol"^(-1))

Calculate the pH of the following solution : (a) 2g of TlOH dissolved in water to give 2 litre of solution. (b) 0.3g of Ca(OH)_(2) dissolved in water to give 500mL of solution. (c) 0.3g of NaOH dissolved in water to give 200mL of solution. (d) 1mL of 13.6M HCl is diluted with water to give 1 litre of solution.

Calculate the pH of the following solutions. a. 0.37g fo Ca(OH)_(2) dissolved in water to give 500 ml solution b. 0.3 g of NaOH dissolved in water to give 200 ml solution c. 0.1825% HCl aqueous solution d. 1 ml of 13.6 M HCl is diluted with water to give 1 litre solution.

AAKASH SERIES-ISOMERISM -ADDITIONAL PRACTICE EXERCISE (LEVEL-I(MAIN) STRAIGHT OBJECTIVE TYPE QUESTIONS)
  1. Optically active compounds among the following is

    Text Solution

    |

  2. Which of the following form diastereomeric pair?

    Text Solution

    |

  3. The optical rotation of a solution of pure natural camphor is found to...

    Text Solution

    |

  4. The R and S configuration for each sterogenic centre in this from top ...

    Text Solution

    |

  5. is

    Text Solution

    |

  6. An enantiomerically pure acid is treated with racemic mixture of an al...

    Text Solution

    |

  7. Which of the following is correctly matched?

    Text Solution

    |

  8. The configuration of the following compound A,B,C n R,S notation are

    Text Solution

    |

  9. Which of the following structures are super imposable?

    Text Solution

    |

  10. Type of isomerism not possible with the molecular formula C(4)H(10)O i...

    Text Solution

    |

  11. I and II are

    Text Solution

    |

  12. Which one is not metamer of

    Text Solution

    |

  13. If the recemic mixture of a carboxylic acid is treated with a dextro r...

    Text Solution

    |

  14. The configuration of

    Text Solution

    |

  15. Which one of the following can exist in optically active forms?

    Text Solution

    |

  16. The name of the molecule shown is

    Text Solution

    |

  17. cis-1,3-Dibromocyclohexane is represented by structure(s):

    Text Solution

    |

  18. For the compound with molecular, formula C(3)H(5)Br(3). The number of ...

    Text Solution

    |

  19. Ortho nitro phenol and paranitro phenol are

    Text Solution

    |

  20. Which of the following oximes is expected to exhibit both geometrical ...

    Text Solution

    |