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Group 14 hydride

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Group 14 hydride

Group 14 hydrides are chemical compounds composed of hydrogen atoms and group 14 atoms (the elements of group 14 are carbon, silicon, germanium, tin, lead and flerovium).

The tetrahydride series has the chemical formula XH4, with X representing any of the carbon family. Methane is commonly the result of the decomposition of organic matter and is a greenhouse gas. The other hydrides are generally unstable, poisonous metal hydrides.

They take on a pyramidal structure, and as such are not polar molecules like the other p-block hydrides.

Unlike other light hydrides such as ammonia, water and hydrogen fluoride, methane does not exhibit any anomalous effects attributed to hydrogen bonding, and so its properties conform well to the prevailing trend of heavier group 14 hydrides.

This series has the chemical formula X2H6. Ethane is commonly found alongside methane in natural gas. The other hydrides of the chemical formula X2H6 are less stable than the corresponding tetrahydrides XH4, and they are more and more less stable as X goes from carbon (ethane C2H6 is stable) down to lead (or flerovium) in the periodic table (diplumbane Pb2H6 is unknown).

All straight-chain saturated group 14 hydrides follow the formula XnH2n+2, the same formula for the alkanes.

Many other group 14 hydrides are known. Carbon forms a huge variety of hydrocarbons (among the simplest alkanes are methane CH4, ethane C2H6, propane C3H8, butane C4H10, pentane C5H12 and hexane C6H14, with a wide range of uses. There is also polyethylene (CH2)n, where n is very large, a stable hydrocarbon polymer, the most commonly produced plastic. Hydrocarbons also include alkenes, which contain a double bond between carbon atoms (e.g. ethylene H2C=CH2), alkynes, which contain a triple bond between carbon atoms (e.g. acetylene H−C≡C−H), cyclic and branched hydrocarbons (e.g. cyclohexane C6H12, limonene C10H16, which is a cyclic hydrocarbon with double bonds between carbon atoms, and neopentane C(CH3)4, which is a branched hydrocarbon), as well as aromatic hydrocarbons such as benzene C6H6 and toluene C6H5−CH3), whose study forms the core of organic chemistry.

Alongside hydrogen, carbon can form compounds with the chemically similar halogens, forming haloalkanes. The simplest of this series, the halomethanes, contain compounds such as dichloromethane CH2Cl2, chloroform CHCl3 and iodoform CHI3. Other such important chemicals include vinyl chloride H2C=CHCl, which is used in the production of PVC.

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