  The studies of the complex organic molecular lines towards the hot molecular
cores at millimeter and submillimeter wavelengths provide instructive knowledge
about the chemical complexity in the interstellar medium (ISM). We present the
detection of the rotational emission lines of the complex nitrogen-bearing
molecule ethyl cyanide (C$_{2}$H$_{5}$CN) towards the chemically rich hot
molecular core G10.47+0.03 using the Atacama Large Millimeter/Submillimeter
Array (ALMA) band 4 observations. The estimated column density of
C$_{2}$H$_{5}$CN towards the G10.47+0.03 is (7.7$\pm$0.5)$\times$10$^{16}$
cm$^{-2}$ with the high rotational temperature of 352.9$\pm$66.8 K. The
estimated fractional abundance of C$_{2}$H$_{5}$CN with respect to H$_{2}$
towards the G10.47+0.03 is 5.70$\times$10$^{-9}$. We observe that the estimated
fractional abundance of C$_{2}$H$_{5}$CN is similar to the existing three-phase
warm-up chemical modelling abundance of C$_{2}$H$_{5}$CN. We also discuss the
possible formation mechanism of C$_{2}$H$_{5}$CN towards the hot molecular
cores, and we claim the barrierless and exothermic radical-radical reaction
between CH$_{2}$ and CH$_{2}$CN is responsible for the production of low
abundant of C$_{2}$H$_{5}$CN ($\sim$10$^{-9}$) in the grain surface of
G10.47+0.03.
