00:02
Dear students, here two reactions are given.
00:03
This is tertiarybutyl methyl ketone, adds h .c .n.
00:08
To give this cyanohydrin and di -turceributyl ketone with h .c .n.
00:14
Gives a cyanohydrine.
00:16
In the first case, the yield is 95 % whereas in the second case, the yield is less than 5%, that is very, very less.
00:23
Then we have to explain the mechanism of any one reaction and in the second case why the yield is very, very, very.
00:30
Low.
00:32
Now we know it is a case of nucleophilic addition reaction.
00:38
This is a case of nucleophilic addition reaction.
00:51
Now here how the addition takes place let us see.
00:55
First hcn dissociates to give h plus plus l minus then the ketone is getting protonated.
01:06
The ketone is getting protonated.
01:10
This is tertiary butyl methyl methyl ketone.
01:21
Keton is getting protonated first...