How do I name a compound when there are some groups in brackets? For example, compounds like:

1)(CH₃)₃C-CH=CH₂

2)[(CH₃CH(CH₃)]₂C(CH₂CH₃)C(CH₃)C(CH₂CH₃)₂

'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