Nitrogen Containing Compounds Question 36
Question: A compound with molecular mass 180 is acylated with $ CH_3COCl $ to get a compound with molecular mass 390 The number of amino groups present per molecule of the former compound is
Options:
A) 6
B) 2
C) 5
D) 4
Show Answer
Answer:
Correct Answer: C
Solution:
[c] During acetylation, one H atom with atomic mass 1 amu of $ -NH_2 $ group is replaced by an acety1 group $ CH_3CO $ [molecular mass=434]. Thus, $ -NH_2+CH_3COCl\to -NHCOCH_3+HCl $ The above equation suggests that the acylation of each $ -NH_2 $ group increases the mass by 42[43-1]. If the molecular mass of the organic compound is 180, while that of the acylated product is 390, then the increases in the mass due to acylation is given by $ 390-180=210 $ Hence, the number of $ -NH_2 $ groups $ =\frac{210}{42}=5 $
BETA
