why CCL3(-) is more stable than CF3(-) ?

Which of the following is most stable?

Options:

1. ​ch3(-)
2. (ch3)c(-)
3. cf3(-)
4. ccl3(-)

'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