brain drain. brain drain. LINK / CITE ADD TO WORD LIST. noun. The definition of brain drain refers to a situation where all or the majority of intelligent, skilled or capable resources within a given field or geographic region leave the area because of various factors including lack of high paying jobs.
Alkylation is an important source for octane in gasoline. Source: Occupational Safety and Health Administration. Alkylation (al-kuh-ley-shun) is a secondary refinery unit operation that many refineries in the United States have because it adds high octane hydrocarbons to motor and aviation gasoline. High octane hydrocarbons are needed to help prevent autoignition of gasoline (knocking) in an engine and to meet recommended engine octane ratings.
An alkyl group is a univalent radical consisting of carbon and hydrogen atoms, with one H atom less than their alkane counterparts. They form homologous series with a general formula of CnH2n+1, while the general formula of the alkanes is CnH2n+2.est Answer: Alkyl groups are substituents that have one less H (hydrogen atom) than the corresponding alkane.