What is the structure of a methyl group?

A methyl group consists of a carbon atom that is bonded to three hydrogen atoms, making the correct answer B accurate. This specific arrangement results in the molecular formula CH₃, which is characteristic of a methyl group.

When considering the structure of a methyl group, it is essential to recognize that the carbon atom has four valence electrons and can form four covalent bonds. In the case of a methyl group, three of these bonds are formed with hydrogen atoms, the simplest and most abundant elements in organic molecules. The remaining bond of the carbon atom can be connected to another atom or group, integrating the methyl group into various larger organic structures, such as hydrocarbons or functional groups.

The other options describe arrangements that do not correspond to a methyl group. For instance, a carbon bonded to two hydrogen atoms represents an ethyl group when another carbon is attached, while a carbon bonded to four hydrogen atoms depicts a methylene group (also known as methane, which is CH₄). A carbon with just one hydrogen atom connected typically lacks the stability found in a methyl group. This understanding of bonding and stability is crucial in organic chemistry, particularly when studying the behavior and reactivity of different functional groups.