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  4. Compound A undergoes formation of cyanohydrin which on hydrolysis gives lactic acid (CH3CHOHCOOH) . Therefore, compound A is

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Q. Compound A undergoes formation of cyanohydrin which on hydrolysis gives lactic acid $ (CH_{3}CHOHCOOH) $ . Therefore, compound A is

Delhi UMET/DPMTDelhi UMET/DPMT 2010

Solution:

Since, compound $A$ gives cyanohydrin, it must contain a carbonyl compound. Thus, its general formula should be
The other attached group to the carbon in the product (ie, lactic acid) are $ CH_{3}$ and $H$. On attaching these groups, we get
This is the formula of compound $A$. Thus, compound $A$ is acetaldehyde.

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