(1) ch3ch2och2ch3 (2) (ch3)2choch3 (3) ch3ch2ch2och3 (1) is a matamer of both 2 and 3. But 2 and 3 are not metamers of each other. How come. Is it not illogical?.

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane