12.18 Give plausible explanation for each of the following: (1) Cyclohexanone forms cyanohydrin in good yield but 2,2,6-trimethylcyclo-hexanone does not.(ii) There are two -NH, groups in semicarbazide. However, only one is involvedin the formation of semicarbazones.(ii) During the preparation of esters from a carboxylic acid and an alcohol inthe presence of an acid catalyst, the water or the ester should be removedas soon as it is formed.

12.18 Give plausible explanation for each of the following: (1) Cycl

1.	12.18 Give plausible explanation for each of the following: (1) Cyclohexanone forms cyanohydrin in good yield but 2,2,6-trimethylcyclo-hexanone does not.(ii) There are two -NH, groups in semicarbazide. However, only one is involvedin the formation of semicarbazones.(ii) During the preparation of esters from a carboxylic acid and an alcohol inthe presence of an acid catalyst, the water or the ester should be removedas soon as it is formed.
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