The name given to the group delimited in the image is ethyl.
What is ethyl?
It is a hydrocarbon from the alkyl functional group.
Ethyl is a substituent derived from ethane. The formula for ethane is [tex]C_2H_6[/tex], whereas, ethyl has one H less than ethane.
Thus, the formula for ethyl is [tex]C_2H_5[/tex].
Looking at the delimited portion of the image, 2 C atoms in C-C bond are bonded by 5 H atoms.
More on alky groups can be found here: https://brainly.com/question/15942698
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