Question

Which choice below correctly ranks the three molecules in order of decreasing rate of reaction with CH, OH in an S, 1 reaction? Select one: a. l>II>111 b. I>II>11 C. II>II> d. III>II> e. I>> 111 Check

Answer 1

In the SNS neaction Carbocation Formation Step is the rate determining Step and the Stability of carbocation will tell us about rate & Oh the realtion lolo the more Stable the carbocation, the more the pate of the neaction.

Carbocation from Ice is Now this carbocation is only stabalised by tl effect of a and b part. So it is least Stable Carbocation and undergo SNL reaction mone slowly than II and II. Carbocation from far is se This carbocation is stabalised by Confagation and as well as by the tI effect of a and bpart and by-CH3 grooup. So it is the most stable Carbocation and undergo SNI reaction mosse faster than I and II Carbocation from the is a This carbocation is stabalised by +I effect of a part, bo part and by - CH3 gr. This Carbocation is more stable than the Carbocation form from Compound I and a less stable than the carbocation form from Compound II. Compound I will under go faster reaction than Compound I and slowes reaction tham Compound II. So the order of decreasing rate of reaction with CH3OH in an SNL reaction is as follows c) II) Illy I