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Polar molecules

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andyman20:
Ok.. this might be realli easy for u but i'm very confused...

The question is

which of the following pairs of compounds would both consist of polar molecules?

a) Carbon dixide and Water
b) Hydrogen bromide and Water
c) Hydrogen bromide and Carbon tetrachloride
d) Carbon dioxide and Carbon tetrachloride

They all look polar to me...

i know that polar molecule has uneven distribution of electrons in the molecule. But doesnt get me the answer... can u tell me the answer and what i hav to know to answer this question?? Thank you ^^

Mitch:
Aside from learning proper spelling and grammar, why don't you tell us why you think carbon tetrachloride is polar.

andyman20:
i thought the molecules were polar if they had uneven distribution of electrons.

Tetrachloride has greater electronegativity  and carbon has lower electronegativity.
Therefore tetrachloride has partial positive charge and carbon has partial negative charge.

isnt it rite??

how do u find out then..?

Mitch:
Yes the bonds are polar, but is the overall molecule polar? I can grab you by the right hand and shove you to the right. But if someone else grabs you by the left hand and we're tugging the same amount, are you moving? The same logic can be applied to carbon tetrachloride.

andyman20:
thanks for the reply
i got it now.. ^^

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