For each pair of compounds circle the compound which has the greater wave number

Question

For each pair of compounds circle the compound which has the greater wave number for the indicated bond. H-F and H-CL Select the compound responsible for the following C-13 NMR spectrum. Assume the R groups are identical and not observed in the C-13 spectrum Which of the following are optically active? 3-methyl-3-pentanol recenic benzamin none of these Select the favored dehrydration product of the following reaction The reaction of an enantiomerically pure compound with a racemic mixture gives products that are identical enatiomers diastereomers not isomers

Explanation / Answer

(13) C is correct. the 2 C-atoms attached to R groups form one group while the remaining 4 form the other group. Thus this compound will give 2 signals.

(14) D is correct because none of the above compounds are optically active. Meso tartaric acid has a plane of symmetry, while 3-methyl-3-pentanol doesnt; have any chiral centre.

(15) B is correct, because it is the most substituted alkene and according to Zaitsev's rule it is the favored product

(16) C is correct, because this is a general separation technique in which a racemic mixturee is treated with an enantiomerically pure compound, and the result is that the enantiomers of the racemic mixture get converted to diastereomers which can then be easily separated.

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