Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Priyanshu kumar
In structure (III) methyl group is attached at one end of double bond which imparts stability to it. Therefore (III) is most stable. Structure (II) also has extra stability due to aromatic cyclopropene ring, but methyl group is not attached directly to doubly bonded carbon, therefore it is less stable than (III). Least stable is (I) as the double bond is present outside the ring and no alkyl group is attached to impart extra stability to it.
So stability order III >II>I
Cyclopropene ring possess aromatic character ...So it is more stable...hence 1st is least stable...
got it dear aswin??
Sir, but in key different. I think here is exception. I got this from YouTube lecture. so please clarify
what is given in your key??