Isomerism NEET
Isomerism
Compounds having same molecular formula but atleast one
difference in their properties. (Physical,Chemical or both)
If D.U is different, molecular formula can’t be same.
If D.U is same, MF may/may not be same.
Never count H- atoms, while checking molecular formula.
Ty p es
Structural Isomers Stereoisomers
r
r
r
Structural isomers:-
MF same but structure different.
Arrangement/Sequence/Connectivity of atoms different.
Two structural isomers can never have same IUPAC.
Ty p es
Chain isomers
Position isomers
Functional/group isomers
Metamers
Ta u to m e rs
n
r
Chain isomers:- have different no. of C-atoms in P.C.C & side
carbon chain.
Eg:-
Document Summary
Compounds having same molecular formula but atleast one difference in their properties. (physical,chemical or both) If d. u is different, molecular formula can"t be same. If d. u is same, mf may/may not be same. r. Never count h- atoms, while checking molecular formula. Two structural isomers can never have same iupac. Chain isomers:- have different no. of c-atoms in p. c. c & side carbon chain. Determine min. no of c-atoms c are required for an open chain alkane to show isomerism. C c c (1)for a cycloalkane to show chain isomerism. C c c c c. Position isomerism:- have some molecular formula but different position of functional group/multiple bond/substituents in p. c. c. Min. no of c-atoms required for an organic compound to show isomerism:-2. Minimum no of c-atoms required for an open chain alkane to show positional isomerism. Alkenes with cycloalkane & alkynes/alkadienes with cyclohexane show ring-chain isomerism. Min no of c-atoms c are required for an alcohol to show f. i.
