Help me with two questions in the attachment please :)

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Help me with two questions in the attachment please :)

Chemistry
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what part is giving you problems?
I cannot figure out how B is correct because wouldn't only Br be replaced with CN ? And after nitril hydrolysis CN changes to CO2H to give carboxylic acid i'm talking about 28

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in fact, CH2Br would be replaced with CO2H
What how? Can you write equation for it plzzzz?
I figured out question 29.
Sorry i had a phone call. Look at the mechanism i attached
1 Attachment
28 ans is B?
This is so confusing :/ what i learned was the reaction between KCN and halogenoalkane and its a nucleophilic reaction halogen is replaced with CN and nitril is hyrolysed so CN gets replaced with CO2H
Yeah @HamidAliAbbasi but do you know the reaction?
"CN gets replaced with CO2H " this is right
sorry, i think im contradicting myself and maybe was wrong initially
yeah B is right
I just checked the markscheme to confirm it's written there B is the correct answer for 28
Oh yeah yeah
But how B is correct that's the problem
|dw:1433542641429:dw||dw:1433542712862:dw||dw:1433542772571:dw|
Oh i think i get check my drawings are they correct?
I just got confused cuzi didn't rearrange them
yep that's right
Understood or should i explain?
I understood thanks :)
awesome

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