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Chemistry: Post your doubts here!

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yeah but why don't we consider C-O bonds too? :p
Energy is released when these compounds undergo combustion ... combustion is basically reacting with Oxygen And compounds A, C, and D already have oxygen in them and have the same number of carbon atoms as B.. so we can considered them to be partly combusted.. Hence only compound B havent got Oxygen in it .. And so the Ans is B
 
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If a compound has a ring in it,does that mean all bonds will be at angles and there will be no possibility of Cis Trans at any double bond inside the ring?
Metanoia

Trans and cis are possible at the double bonds when the ring has 8 or more carbons.
 
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View attachment 54634 how is the answer c...
plz help :)
The solubility of Group 2 hydroxides increases down the group .. so we can say that Barium hydroxide will be more soluble than calcium hydroxide ... hence when these two solutions are mixed together .. it will be the Calcium hydroxide that will be responsible for the white precipitate due to its less solubility compared to barium hydroxide .. and the filtrate will be containing Barium hydroxide .. And so when CO2 gas is bubbled to this filtrate .. it will react with Barium hydroxide forming Barium carbonate ...

Hope it helps !!!!!!
 
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View attachment 54635 the marking scheme says answer is c but how r there 3 geometric isomers???
There are 2 double bonds so you can have these combinations:
Cis at the first double bond and Cis at the second
So keep on changing and following the same pattern you can have:
C=cis and T= trans
CC
TT
CT / TC
Since the hex-2,4-diene is optically same (shows the same formula when read backwards and forwards), the CT and TC will count as one (it will just be a mirror image of each other)
 
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