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Chemistry: Post your doubts here!

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The answer to this is C...although I know that there will be no dipole moment in CO2 but does that also mean that it will not have permanent dipole-dipole interactions?

CO2 does not have pd-pd interaction as it has no overall dipole moment
 
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CO2 does not have pd-pd interaction as it has no overall dipole moment
But due to difference in electronegativities, it DOES have dipoles...so won't there b pd-pd forces due to the presence of dipoles, despite the fact that it has no dipole moment ?
 
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View attachment 63820
How to do this? Im having paper 1 in 3 days and stressing out right now because of this question:'( Help

The answer is D

I guess the examination report explain it enough

Question 28: The correct answer was D. The most commonly chosen incorrect answers were A and B. These answers, A and B, both have compound X having a cyclopentane ring which would have to be opened by the reaction with ammonia. This will not occur. Compound X must be 1,5-dibromooctane. The reaction of 1,5-dibromooctane with ammonia takes place by nucleophilic substitution in two steps. In the first step of the reaction an –NH2 group substitutes for one of the bromine atoms. Since this –NH2 group has a lone pair it can attack the δ+ carbon atom of the second C-Br by the same nucleophilic mechanism, giving coniine as the organic product.
 
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ans is D?

Apart from guess work i mean trying the options one by one I can not find any other way.
X + H2O------>Al(OH)3 + hydrocarbon gas(HC)..unknown
HC(g) + O2------>H2O + CO2

cancel out the hydrocarbon and water molecules from both side of the equations to make it an overall equation

considering option D.

Al4C3 + 9O2+ 12H+ ------>4Al(OH)3 + 3CO2
mol of CO2=108/24000=4.5*10-3
3:1.......mol of Al4C3=1.5*10-3
Mr=144
option D is correct.
 
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Apart from guess work i mean trying the options one by one I can not find any other way.
X + H2O------>Al(OH)3 + hydrocarbon gas(HC)..unknown
HC(g) + O2------>H2O + CO2

cancel out the hydrocarbon and water molecules from both side of the equations to make it an overall equation

considering option D.

Al4C3 + 9O2+ 12H+ ------>4Al(OH)3 + 3CO2
mol of CO2=108/24000=4.5*10-3
3:1.......mol of Al4C3=1.5*10-3
Mr=144
option D is correct.
thanks a lot :D
 
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