Which of the following does not show geometrical isomerism?

(1) 1, 2-dichloro -1 – pentene

(2) 1, 3 – dichloro – 2 – pentene

(3) 1, 1 – dichloro – 1 – pentene

(4) 1, 4 – dichloro – 2 – pentene

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane