Interesting Chemistry
Which of the following are chiral(optically active) ?
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Benzoic acid
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Pent-2,3-diene ( C H X 3 − C H = C = C H − C H X 3 )
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Hex-2,3,4-triene ( C H X 3 − C H = C = C = C H − C H X 3 )
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1,1,3,3-tetrachloroProp-1,2-diene ( C C l X 2 = C = C C l X 2 )
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2-(2-Carboxy-6-Nitrobenzyl)-3-Nitrobezoicacid
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cis-1,2-dimethylcyclobutane
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cis-1,2-dimethylcyclopropane
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Hept-2,5-dien-4-ol ( C H X 3 − C H = C H − C H ( O H ) − C H = C H − C H X 3 )
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Fumaric acid
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cis-but-2-ene
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1-ethyl-2-methylcyclopropane
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Mesitylene
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All compounds containing chiral carbon.
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Enantiomer ( not the mixture )
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All cumulative Dienes. (Of the type :eg: options 2 & 4)
Enter your answer as the product of the respective option numbers of correct response.
C l a r i f i c a t i o n If you think statements 2,3 and 5 are true, enter your answer as 2 × 3 × 5 = 3 0 .
This is a part of my set Aniket's Chemistry Challenges . (BEST OF JEE - ADVANCED)
The answer is 12320.
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1 solution
- 8 is clearly wrong as when both double bonds are in cis position plane of symmetry arises and no optical activity is there .(you asked definitely chiral not could be chiral)
- 14 is clearly wrong as when you say enantiomers you always mean a mixture of them that is R and S. They nullify each other's optical activity . A system of enantiomers is optically inactive, called racemic mixture. You should specify single enantiomer in your question. And should be 2,5,11
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For the first one I agree , I have removed the word definetely from the question..........but for the second one I don't agree as I didn't say for mixture......ou are not ought to take it as a mixture unless specified.......I wrote Enantiomers to make it clear that they are of the same molecule
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hey 8 is optically inactive clearly then how could removing word definetely removal make it justified.
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@Aryan Goyat – It can be optically active as on one side Cis and on side trans would make it optically active (pseudo carbon)
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@Aniket Sanghi – but you should mention it then in that case what about 13 it can be also so please change the ans
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@Aryan Goyat – That's the exception .....how can I mention that ......13 is alright (clearly mentioned'all')
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@Aniket Sanghi – sorry i didn't noticed all
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@Aryan Goyat – I dont mind , mistakes gives rise to perfection!
FYI cumulative dienes are of type n.n+1 so 2,3 is cumulative diene and 2,4 is a conjugated diene .
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I didn't b get what u want to say ?
Got ! Are I meant options 2 and 4 above 😂
Sorry but 8 is not correct.you must correct your answer.
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8 in indeed correct . It's pseudo Chiral centre . It's a famous exception . Take cis on one side and transnon other and you will get 4 different groups.!
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Okay since it was not mentioned which configuration to be taken (cis or trans),it is indeed chiral.Sorry for my mistake.
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@Mayank Jha – Nevermind , Mistakes makes one perfect
2,5,8,11,14 are correct