____________________
are
made
of
carbon
and
hydrogen
____________________
,
so
they
are
called
hydrocarbons
.
Their
general
formula
is
:
CnH2n
and
the
Alkene
____________________
have
at
least
one
____________________
-
carbon
double
____________________
bond
(
C
=
C
)
which
is
nucleophilic
that
is
it's
attracted
to
places
that
don't
have
enough
electrons
.
That
means
the
double
____________________
is
attracted
to
positive
____________________
.
