IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry

VARSHINI

1.Why is 3-methyl-4-ethyl heptane not in IUPAC system?????????

2.On monochlorination of 2-methylbutane,the no.of chiral compounds formed are:

3.The molecular formula of diphenyl methane is C13H12.How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom????????????????

4.The no. of isomers for the compound with molecular formula C2BrClFI is

5.The no. of structural isomers possible for an organic compound with molecular formula C6H14 are:

ackhill

1.as e comes first of m..
2.2
3.2
4.2
5.20

i hope its right..!:-!

VARSHINI

PLEASE GIV DA METHOD

fwks_phoenix

for Q.1. ackhill has already given d method

for no. of chiral carbons, count the carbon atoms that r attached to 4 different groups or atoms...

for isomers in general.. find out what all isomerism is exhibited by the compound.. and then find the possible isomers..

for chain isomerism, first try n-isomer , then sec n then tert.. for functional, change the functional grp (mostly it'll b 2)..for position isomers, change the position of func grp n see.. simple.. :)

eragon007

1. e cums bfr min the eng alfabets
2. one chiral centre present--hence on finding diff(by changing pos of func grp) structures we get ans-> 2
3.the molecule is cyclic on changing osn of any one double bond we can get only
2 possible stuctures of the mono halide structure
4. i thinl that such a comp may not exist( check it again)
5.20(you will hav to move all func grps and draw them by hand)

i hope this has helped

iberis22

The no. of structural isomers of C₆H₁₄ is 5.

1. Hexane

2. 2-Methylpentane

3. 3-Methylpentane

4. 2,2-dimethylbutane

5. 2,3-dimethylbutane

iberis22

1.

Cl I 2. Cl Br

\ / \ /

C = C C = C

/ \ / \

F Br F I

3. 4.

Cl I Cl F

\ / \ /

C = C C = C

/ \ / \

Br F Br I

5. 6.

Cl F Cl Br

\ / \ /

C = C C = C

/ \ / \

I Br I F

dev_22oct

only 2 chiral compound obtained by following attacks.

CH₃CCl(CH₃)CH₂CH₃ chlorination at position 1.

CH₃CH(CH₃)CH(Cl)CH₃ chlorination at position 3.

dev_22oct

4 Structural isomers are possible

1) 3 isomers are producded by subsitution at either ortho meta or para position

2) 4th isomer is produced by by subsituting hydrogen of methane.

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