JEE ADVANCED 2011 SOLUTION I STEREOISOMERS скачать в хорошем качестве

JEE ADVANCED 2011 SOLUTION I STEREOISOMERS

Please switch to 1.25/1.5x for better experience A number of direct questions have been asked from the topic of isomerism over the past years. Isomerism also appears in the questions indirectly. Identifying type of isomers, calculating the number of isomers possible, properties of isomers are some of the common questions based on isomerism. The case of isomerism becomes very interesting when we have to imagine the 3-D structure of molecules. This opens up a whole new segment of this topic which is STEREOISOMERS. Stereoisomers arise when in two different molecules a carbon is attached to same four group of atoms but their spatial arrangement in 3D space is different in each of these molecules. This results in different properties of these molecules. If the molecules are related as non-mirror images, they are termed as diastereomers. If they are mirror images of each other and are non-superimposable then they are termed as enantiomers. If they are mirror images and are superimposable, then they become identical. The discovery of stereoisomers dates back to work of LOUIS PASTEUR. When he was able to separate crystals of Lactic acid and found out that two crystals look exactly like each other but in no way they could be superimposed on each other. These two molecules are different was found out by measuring their optical activity. If one of the molecule rotated the plane of polarised light in clockwise direction, then the other was found to rotate it in anticlockwise direction by same amount. THese molecules were related as non-superimposable mirror images and are called as enantiomers. Later studies were done on tartaric acid. It led to discovery of a new category of stereoisomers - Mesomers. Molecules having at least two chiral centers but their optical activity is zero due to internal symmetry (presence of POS/COS) are called mesomers. Please go through the lecture and let me know if you have any questions or explanations that you may need. Thank you so much for watching. Please consider subscribing the channel to support my work.Also Share among your friends who might be benefitted from this lectures. You can contact me at: wikiofchemistry@gmail.com #jee #neet #mains #organicchemistry #pyqs #solution #carbocations #ncert #class11 #class12 #cbse #solved TIME STAMPS 00:00 QUESTION 02:55 APPROACH 10:14 AVOID DOUBLE COUNTING 11:40 ANSWER 12:00 DISCUSSION THANKYOU FOR WATCHING