Stereogenic Carbon atoms

Question

Does anyone know how to work out which of these compound contain stereogenic carbon atoms:

1-bromoheptane

2-bromoheptane

3-bromo-3-methylhexane

??

Answer 1

2-bromoheptane

CH3

l

C(Br)(H)

l

CH2

l

CH2

l

CH2

l

CH2

l

CH3

the # 2-carbon has four different groups attached to it

-H, -Br. -CH3, -C5H11

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3-bromo-3-methylhexane is also stereogenic

CH3

l

CH2

l

C(Br)(CH3)

l

CH2

l

CH2

l

CH3

the # 3-carbon has four different groups attached to it

-C2H5, -Br. -CH3, -C3H7