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chemistry - isomers Q help please

Deduce the number of monochloro isomers formed by isooctane.
Draw the structure of the monochloro isomer that exists as a pair of optical isomers.
Number of monochloro isomers ....................................................................
Structure :



i get the first bit, but am unsure of the structure ?
To have optical isomers there must be a chiral carbon. I.e one where there are 4 different atoms/groups around one carbon.
Original post by Mole man
To have optical isomers there must be a chiral carbon. I.e one where there are 4 different atoms/groups around one carbon.

oh so, Cl, H, C4H9, C3H7 so just put the Cl in the middle C
Original post by strwberrynewts
oh so, Cl, H, C4H9, C3H7 so just put the Cl in the middle C


That's the idea. Check you have four different atoms/groups around one carbon.

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