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Physics, Chemistry and Biology: Post your doubts here!

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Hi there, can someone please explain why the answer to this MCQ is C?

Butanedioic acid occurs in amber, algae, lichens, sugar cane and beets. It may be synthesised in two steps from 1,2-dibromoethane.
BrCH2CH2Br ----> X ----> HO2CCH2CH2CO2H
Which reagents could be used for this synthesis?
step 1 step 2
A HCN(g) HCl(aq)
B HCO2Na(aq) HCl(aq)
C KCN(aq/alcoholic) H2SO4(aq)
D NaOH(aq) K2Cr2O7 /H2SO4(aq)
Thanks in advance!
 
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What name and structure did you drew for the 2nd member of alkene group
And how many marks was this question?
 
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I wrote sulfuric acid and (250 degree celcius which I know is wrong) We didnt study any conditions for esterfication did we?
What did you write?
If u r from pises then it was clearly written in our book that it is concentrated sulfuric acid
 
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