Atoms of what element form the backbone of large organic molecules?

• A. $O$xygen
• B. $C$arbon
• C. $H$ydrogen
• D. $N$itrogen

Answer: (B)

Verified step by step guidance

1. Understand that large organic molecules are primarily composed of atoms connected in long chains or rings, which form the 'backbone' of the molecule.
2. Recall that the element which can form four covalent bonds, allowing for complex and stable structures, is essential for creating diverse organic molecules.
3. Identify that carbon atoms have four valence electrons, enabling them to form four covalent bonds with other atoms, making them uniquely suited to form the backbone of organic molecules.
4. Recognize that while elements like hydrogen, oxygen, and nitrogen are important in organic molecules, they typically attach to the carbon backbone rather than forming it.
5. Conclude that the backbone of large organic molecules is formed by carbon atoms due to their bonding versatility and ability to create stable chains and rings.