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Professor I.L. Finar instructed his student to convert of alpha -Amino acid (X) into a new compound (Y) in which the - NH_2 group is replaced by-COOH group. The student was confused in writing the correct IUPAC names of these two compounds.The correct IUPAC names of X and Y will be respectively

Two hundred students of class VI and VII were asked to name their favourite colours so as to decide upon what should be the colour of their school house. The results are shown in the following table. Colour:, Red, Green, Blue, Yellow, Orange Number of student, 43, 19, 55, 49, 34 Represent the given data on a bar graph. Which is the most preferred colour and which is the least? How many colours are there in all?

A student names a certain compound as 2, 3 -diethylbutane. Its correct IUPAC names is: