1)Define the term'geometric isomers'

Question

2)Give geometric isomers and corresponding names for the following condensed structural formula: CH3CH2(CH)2CH3

Answer 1

Geometric isomers are compounds that have the same atoms connected in the same order but the relative positions of the atoms are different.

CH3CH2(CH=CH)CH3 I presume is what is meant.

There are two geometric isomers, one where the Hs of the CHs are on the same side and one where they are on opposite side of the double bond.

The names are

Z-2-pentene

(see http://www.chemspider.com/Chemical-Structure.4483638.html)

and

E-2-pentene
(see http://www.chemspider.com/Chemical-Structure.4483639.html)