Engineer & Medical

Exam 2012 Chemistry question bank (Chemistry)

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Q1.

What is the product obtained in the reaction of acetaldehyde with semicarbazide?

(A)
$H_3C-CH=N-NH-C(=O)-NH_2$
(B)
$H_3C-CH=N-NH_2$
(C)
$H_3C-CH=N-OH$
(D)
$H_3C-C(CH_3)=N-NH-C(=O)-NH_2$
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Q2.

Compound $A$ $(C_3H_6O)$ undergoes the following reactions to form $B$ and $C$. Identify $A, B$ and $C$.

figure

(A)
$A = CH_3COCH_3, B = CHI_3, C = CH_3CH_2CH_3$
(B)
$A = CH_2=C(H)CH_2OH, B = CH_3I, C = CH_3CH_2CH_2OH$
(C)
$A = CH_3CH_2CHO, B = CHI_3, C = CH_3CH(OH)CH_3$
(D)
$A = CH_3COCH_3, B = CHI_3, C = CH_3CH(OH)CH_3$
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