Final answer:
The correct statements among the options provided are B, C, and D, which correctly identify a methyl group, classify alkanes as saturated hydrocarbons, and state that organic compounds are primarily composed of carbon and hydrogen.
Step-by-step explanation:
When addressing the statements about organic compounds:
- B. -CH3 is called a methyl group: This statement is correct. A -CH3 group is indeed referred to as a methyl group in organic chemistry.
- C. Alkanes are saturated hydrocarbons: This statement is correct. Alkanes are a type of hydrocarbon with only single bonds between carbon atoms and are thus considered saturated.
- D. Organic compounds are primarily composed of carbon and hydrogen: This statement is correct. As the most basic definition, organic compounds must contain carbon, and typically hydrogen is also a predominant element.
However, some statements are not correct:
- A. Organic compounds are never synthesized in the lab: This statement is false. Organic compounds can indeed be synthesized in laboratories.
- E. Organic compounds are usually flammable/combustible: While many organic compounds can be flammable or combustible, it is not accurate to say that all organic compounds are usually so, since properties vary widely.