alkynes
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8 Terms
ethyne
explosive gas
used in oxyacetylene welding
but-1-yne
a terminal alkyne
but-2-yne
an internal alkyne
structure
a linear structure is adopted and it is sp hybridised
sp hybridisation
the s and one p orbital are hybridised to form 2 hybrids
energy is halfway between s and p orbitals
unsymmetrical dumbbell shape
angles of 180 degrees to each other
hydrogenation
a syn addition
a poisoned catalyst can be used to form alkenes selectively
alkylation
the H of a terminal alkyne can be removed using a very strong base
the lone pair of electrons on the C in the carbanion is in an sp hybrid orbital
only terminal alkynes are acidic
reaction with a haloalkane and
a new C-C bond is formed
stable halide ion is formed
Sn2 reaction
Note 
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