Question

1. These questions consider leaving groups in an SN1 reaction.

a. Which is theoretically a better leaving group, bromine or chlorine?

b. Which sets of reactions that you performed today compare ONLY the reactivity of bromine and chlorine and NOT any other effect?

c. What were the reaction times for these reactions?

d. Does the data from your experiment match with the result you would expect theoretically?

e. In one or two sentences, summarize the results that you have found that compare bromine and chlorine and leaving groups. Include the specific data that prove your point.

Answer 1

Bronno es considered to be a better leaving group tesu chlorine for the reaction mechanism occuring via Sn' .-br>-0 The electronegativity is not always the good indicator of the stability of a hearing group. order of stability in halogens inste reaction us of < cea Brain Generally we see that leaving to look groups to be good , we groups to be good , we need ving at their acidilir ally me more stable the leaving Ye more stab group more it is realetivě Also, the increasing site of the halogen decides the reactivity of halogens soniectives . The reaction times a the two lea reactions having the leaving groups as ce and bromune may vary ao del Sule asn'heaction contain Br as the laring group is found to be faster than those containing - as the leaving group'. In short we can say, a bettes the ledning a occurs faster (d) yes, it does match with the result a for faster se bo Leaving group=Br. to group, the Substitution reactie xoH The fixet veaction is faster because they bromide is the sarger stable halogen than chlorine, thereby forming a weaker bond with the compound and this results vú speeduig up of the RDS Stepiae. rate determining step