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General reaction scheme for the S N 1 reaction. The leaving group is denoted "X", and the nucleophile is denoted "Nu–H". The unimolecular nucleophilic substitution (S N 1) reaction is a substitution reaction in organic chemistry.
During the Vietnam War (or Second Indochina War), Tan Son Nhut Air Base (then using the Southern spelling "Tân Sơn Nhứt") was an important facility for both the U.S. Air Force and the Republic of Vietnam Air Force. Between 1968 and 1974, Tan Son Nhut Airport was one of the busiest military airbases in the world.
The Vietnamese Wikipedia initially went online in November 2002, with a front page and an article about the Internet Society.The project received little attention and did not begin to receive significant contributions until it was "restarted" in October 2003 [3] and the newer, Unicode-capable MediaWiki software was installed soon after.
Vietnamese (tiếng Việt) is an Austroasiatic language spoken primarily in Vietnam where it is the official language. It belongs to the Vietic subgroup of the Austroasiatic language family. [5] Vietnamese is spoken natively by around 85 million people, [1] several times as many as the rest of the Austroasiatic family combined. [6]
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This is a timeline of Vietnamese history, comprising important legal and territorial changes and political events in Vietnam and its predecessor states. To read about the background to these events, see History of Vietnam. This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources. Prehistory ...
Vua tiếng Việt (lit. ' King of Vietnamese ' ) is a Vietnamese television quiz show featuring Vietnamese vocabulary and language, produced by Vietnam Television . [ 1 ] [ 2 ] The programme is aired on 8:30 pm every Friday on VTV3, starting from 10 September 2021, with the main host Nguyễn Xuân Bắc.
Vietnamese uses 22 letters of the ISO basic Latin alphabet.The four remaining letters are not considered part of the Vietnamese alphabet although they are used to write loanwords, languages of other ethnic groups in the country based on Vietnamese phonetics to differentiate the meanings or even Vietnamese dialects, for example: dz or z for southerner pronunciation of v in standard Vietnamese.