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 alkyne is a hydrocarbon containing a carbonâcarbon triple bond; the simplest member ofthis family is acetylene, HLC'CLH. The chemistry of the carbonâcarbon triple bond issimilar in many respects to that of the carbonâcarbon double bond; indeed, alkynes andalkenes undergo many of the same addition reactions.he sufï¬x ane in the name of the corresponding alkane is replaced by the sufï¬x yne, and the triple bond is given the lowest possible number.Substituent groups that contain a triple bond (called alkynyl groups) are named by replac-ing the ï¬nal e in the name of the corresponding alkyne with the sufï¬x yl.