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Q64. Which of the following species are antiaromatic? A) I and II B) II and III C) III and IV D) I and IV Can u help me here ...i think the ans is B since aromatic compounds have a (4n+2)pi electrons in their ring according to the Huckel's rule but is there any other rule so as to find the anti - aromatic compound and if so pls specify.... Is my ans right??? If not pls give the right ans with the apt explanation Geez..Thank You


Q64. Which of the following species are antiaromatic?











A) I and II











B) II and III











C) III and IV











D) I and IV


 


Can u help me here ...i think the ans is B since aromatic compounds have a (4n+2)pi electrons in their ring according to the Huckel's rule but is there any other rule so as to find the anti - aromatic compound and if so pls specify....


Is my ans right??? If not pls give the right ans with the apt explanation


 


 


Geez..Thank You

Grade:12

2 Answers

sharanya Shyamdas
19 Points
10 years ago

I think Option C is correct..Coz III has got only 4 pi-electrons..So Huckel's rule disobeyed... N IV obviously

Compound II has no pi electrons! So no need to consider..

Anyway right option is either C or D.

vikas askiitian expert
509 Points
10 years ago

surely option C is correct ...

for anti aeromatic - all carbons should be in conjugation & should not follow (4n+2) pi ectron rule ...

I,II are both aeromatic but III,IV both anti aeromatic coz all atoms are in conjugation but system has

4 pi electrons from 2 double bonds & thus violates (4n+2) rule ..

4n+2 rule means - for n =0, 1,2  pi electrons are 2,6,10 .....so on

number of pi electrons should be 2 , 6 , 10 ....

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