How many pars of four six eight twelve The four isomeric do I and III ll and Ill

Question

How many pars of four six eight twelve The four isomeric do I and III ll and Ill II and IV IV only Which of the following statements is false? Racemic mixtures are optically inactive Enantiomers have specific rotations which are equal, but have opposite signs Achiral molecules do not have chial centers Meso compounds are achira molecules What are the R/S assignments in this molecule? (assume the carbons are numbered as shown) 2S, 3R 2S, 3S 2R, 3S 2R, 3R Which of the following is a less favourable method to make bromocyclopentane? cyclopentanol plus HBr cyclopentanol plus PBrs cyclopentane plus Br_2 with light cyclopentanol plus NaBr Alkyl sulfonates undergo the same type of substitution reactions as alkyl halides and can also be prepared from alcohols. What advantage does the preparation of an alkyl sulfonate from an alcohol have over this preparation of an alkyl halide from an alcohol? the preparation of an alkyl sulfonate can be carried out at a much lower temperature and with less expensive the configuration at the chirality center in the alcohol is retained in the alkyl sulfonate product and the alkyl sulfonate product is formed with complete inversion of configuration the alkyl sulfonate loses its optical activity and is therefore lower in energy

Explanation / Answer

24) The total number of isomers possible for the given sugar is,

D.

25) Optically inactive isomers are,

C. II and IV

26) False statement here would be,

C. achiral molecules do not have chiral center

27) The configuration R/S for the given compound would be.

B. 2S,3S

28) Least favorable method to prepare bromocyclopentane would be,

C. cyclopentane with Br2 and light

29) The advantage of alky sulfonate preparation from alcohol is,

B. The chirality is retained in the alkyl sulfonates

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