Question

2. In lab, we learned that Br makes a better leaving group than Cl. Do your results (how fast the reaction took place, if a reaction took place, how much participate was produced, etc.) agree with this? Explain. Give specific examples from your results. For the S1 reactions in this lab, what was the identity of the nucleophile? What was the solvent? What are the best types solvents for SN1 reactions. 4. For the S2 reactions in the lab, what was the identity of the nucleophile? What was the solvent? What are the best types solvents for SN1 reactions. 5. Describe the suitability of the following substrate for an Sni and Sn2 reaction (is it reactive under Sw1/Sy2 conditions? Why or why not, be very specific!) 6. Describe the suitability of the following substrate for an SN1 and 52 reaction (is it reactive under 5.1/5.2 conditions? Why or why not, be very specific!) Br нс HH

Answer 1

Following is the - complete Answer -&- Explanation: for the first question ( i.e. Question - 2 ), of the given: Question Set.....in....typed format....

$\Rightarrow$Answer:

If we look at the rate at which: the aqueous solutions: of the following acids: i.e. HBr and HCl  , dissociate, we would be able to find, from the results: that Br ^- ( Bromide ), is a better leaving group: than: Cl ^- ( Choride ion ). We will find, HBr to be a stronger acid: than HCl , i.e. this implies: that: HBr, is a better proton donator: than HCl, and thereby it proves that Br ^- is a better leaving group: than : Cl ^-

$\Rightarrow$Explanation:

• Step - 1:

We know the following:

$\Rightarrow$ For HBr , : the value of pKa = - 9  

$\Rightarrow$ For HCl , the value of  pKa = - 6

• Step - 2:

​​​​​​​We know:

$\Rightarrow$Lower the : pKa, the higher: the K_a value: , i.e. stronger the acid: i.e. the acid will dissociate: more readily and rapidly, than the acids: having higher : pKa values...

• Step - 3:

Thereby: following are : balanced chemical equations: for dissociation of HBr and HCl  , into corresponding cations, and anions...

1. HCl (aq)   $\rightleftharpoons$ H⁺ (aq) + Cl ^- (aq)   --------------------------Equation - 1
2. HBr (aq) $\rightleftharpoons$ H⁺ (aq) + Cl ^- (aq)   --------------------------Equation - 2

• ​​​​​​​Step - 4:

​​​​​​​During , experiments, we would be able to see:  Equation - 2 , reaction: is faster than and more rapid: than : Equation - 1, which proves, that: HBr, is the stronger acid: among the two acids: and is therefore: a better , proton donator, if compared...Therefore, it simultaneously proves: ; Br ^-is a better Leaving Group: than Cl ^- ...