Which of the following molecules represents the
order of hybridisation ``sp^2``, ``sp^2``, sp, sp from left to
right atoms ?
(1) ``\ce{HC#C-C#CH}``
(2) ``\ce{CH2=CH-C#CH}``
(3) ``\ce{CH2=CH-CH=CH2}``
(4) ``\ce{CH3-CH=CH-CH3}``