Question

For the following substitution reactions, choose whether reaction A or B will proceed more quickly. If they will proceed at the same rate, put an equal sign,"=", in the box. Reaction Pair Faster? SN1 or SN2? A: CH3Br + CH30-→ CH3OCH3 + Br- B: CH3Br + CH3OH → CH3OCH3 + Br- + H+ Cl + NH3 NH + Cl + H+ B: Ya + Ho — you +C+++11+ OH + Cl + H+ I + NH3 NH2 +I+H+ SN2 ci + NH3 NH2 + Cl + H+ + Br A: Br + CH30 (high concentration) Na +Br Na + Br Br + CH 0 (low concentration) Br +CH S (high concentration) + Br Br + CHES (low concentration) On the line write "SN1" if the statement is true for SN1 reactions, "SN2" if it is true for SN2 reactions, "both" if it is true for both and “neither" if it is true for neither. _The reaction goes faster with a better leaving group. Increasing the concentration of the electrophile makes the reaction go faster. Tertiary electrophiles react more slowly than secondary electrophiles. _Stereochemical configuration at the electrophile is retained during the reaction. _There is a carbocation intermediate.

Answer 1

O CH₂ BY + CH3 CH₂ CH₂ + B6 SN 2 Reaction B CH3 B8 + CH₃OH CH₃ CH3 + B5 +40 SN 2 Reacts A is when Faster Reaction In SN 2 Reaction mechanism nucleophile is "Anion' more favourable to swa Reaction ② A. Yu + NH3 r H t cit o sad B. Yp cl + H20 ott frétH SN2 A and B Both are SNZ Reaction lalkyl halide are more favourable SN2 Reaction I alkyl halide 7 20 alkyl halide 730 allyl halide. SNZ Reaction mechanism more favourable to Anions. Leaving power of Group o I Bosicity of group A reaction NH3 is more Basic than H2O B is more Reactive than it [. Bis faster Reaction] H2O is weaker Bosicity of a group of the substrale The H2O is better leaving group tham wH3. o .: - B h twHg - e d to Nating Male +1 +H® with to the B

lides ondergo 5, I rean um up the order of only on the Purther, greater s, allite and thus fornu ForS Both A and B are sna mechanism falkyl halide are more favourable to sou2Reactan " : A is more Reactive than B. A is faster Reaction. Todine is better because of its larger size leaving group GA: Br+ CHao high concentration na +Br@ B N° + + Br ABY + cuco low Concentration Primary alkyl halide are more Favourable to sw2 Reaction. SN 2 Realtion mechanism is more favourable to anion . Ais Faster Reaction than B it' SNZ Reaction contains Anion is more earbentrations (high concentration) + CH3 (low concentration) to sw' This A and B Reaction are more favourable to sn! SN' reacties are more Favourable to tertiary alkyl halide & SN reaction more favourable to neutral atom B Reaction is Faster Reactions than 'A' "because low concentration Anion."

----> the leaving power of the group $\alpha$ 1/basicity of group

------> increase the concentration of electrophile reaction is faster.

electro phile can attack the highly electron density so concentation of electro phile increases reaction is faster.

------>tertiary electro phile are slow than secondary electro phile because more sterically hindrence in tertiary electrophile

----------->stereo chemical configuration retention configuration is more favourable electro philes because front side attack of electrophile is more favourable to stereo configuration.

------------->electro phillic substitution carbocation is reactive intermediate is formed