A) 6
B) 2
C) 5
D) 4
Correct Answer: C
Solution :
[c] During acetylation, one H atom with atomic mass 1 amu of \[-N{{H}_{2}}\] group is replaced by an acety1 group \[C{{H}_{3}}CO\] [molecular mass=434]. Thus, \[-N{{H}_{2}}+C{{H}_{3}}COCl\to -NHCOC{{H}_{3}}+HCl\] The above equation suggests that the acylation of each \[-N{{H}_{2}}\]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 \[-N{{H}_{2}}\]groups \[=\frac{210}{42}=5\]
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