write any three method of preparation of alkanes alkenes alkynes
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Answer:
In chemistry, an alkali (/ˈælkəlaɪ/; from Arabic: al-qaly "ashes of the saltwort") is a basic, ionic salt of an alkali metal or alkaline earth metal chemical element. An alkali also can be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0
are prepared by reacting an acid with a metal or a base, such as a metal carbonate, hydroxide or oxide. The acid provides the non-metal ion for the salt, e.g. chloride or sulphate or nitrate ions. The metal or base provides the metal ion for the salt, e.g. sodium or copper.
An alkaline solution is a mixture of base solids dissolved in water. The potential of hydrogen, also known as the pH scale, measures the alkalinity or acidity level of a solution. The scale ranges from zero to 14. The midpoint 7 represents a neutral pH. A neutral solution is neither an acid nor alkaline.
Alkane can be produced from alkyl halides predominantly by two ways: Alkanes can be prepared from alkyl halides (except fluorides) through reduction with zinc and dilute hydrochloric acid.
General Methods of Preparation of Alkenes:
Dehydration of Alcohols.
Dehydrohalogenation of Monohalides.
Dehalogenations of Dihalides.
Larger alkynes can be generated by reacting an alkyl halide with an acetylide ion, which is generated from a shorter alkyne. Because acetylide ions are bases, elimination reactions can occur, leading to the formation of an alkene from the alkyl halide.
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