Minimum no. of rats needed for finding poison in bottle....google puzzle

Question:
There are 8 bottles, one has poison. What's the minimum number of rats you need to find the poison bottle in time T, and how? (You get the rats you need all at once, feed them all at the same time, and poison kills them after time T.)

Solution: Arrange numbers 1-8 in 2X4 matrix with no consecutive...Adobe puzzle

Solution:

1. keep no. in group of two alternate numbers.
{1,3} {2,4} {5,7} {6,8}

2.now fill the center 4 block with two group containing first and last number.
(1,3) {6,8}

- 1 8 -

- 3 6 -

Arrange numbers 1-8 in 2X4 matrix with no consecutive...Adobe puzzle

Question:
There is a 2X4 matrix, in this you are supposed to arrange the numbers from 1-8, so that no consecutive numbers are adjacent(vertically, horizontally and diagonally) to each other. It is possible to do if one keeps on trying it randomly
but it can be done with an intelligent approach too. What would that be?