conjugate base 18. Which of the indicated protons in the molecule drawn below is

Question

conjugate base 18. Which of the indicated protons in the molecule drawn below is most acidic? H C Hd He 19, when a carbonyl compound containing no stereocenters is reduced with a reagent such as LIAIH or NaBHs and a new stereogenic center is formed, what will the composition of the product mixture be? A) A racemic mixturo of the two possible enantiomers carbonyl 8) Contains more of one enantiomer than another because of steric reasons around the C) Contains more o Ione enantiomer than another depending on the temperature of the reaction D) Contains different products depending on the solvent used

Explanation / Answer

18) Hd is the most acidic proton of all the indicated protons.

Hd is on the alpha carbon of a strong electron withdrawing group(-CN) by -I as well -M .

Thus Hd is the most acidic of all .

19) The carbonyl compound does not have a sterocenter.

When it is reduced with LiAlH4 or NabH4 , the planar sp2 carbon of carbonyl is converted to a new sterocenter, thus the product is a racemic mixture of two possible enantiomers . It is due to the fact that planar carbonyl carbon can be attacked from either side(top or bottom) giving both the enatiomers.

OPTION A

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