Arrange the given words in alphabetical order and choose the one that comes first.

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$ and $6$. Below are given four alternatives containing combinations of these numbers. Select the combination of numbers so that the letters arranged accordingly form a meaningful word.
$I, P, E, L, O, C$
$1, 2, 3, 4, 5, 6$

Find which one word cannot be made from the letters of the given word.
$CHROMATOGRAPHIC$

Number of letters skipped in between adjacent letters in the series increases by one. Which of the following series observes the rule given above?

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$ and $6$. Below are given four alternatives containing combinations of these numbers. Select that combination of numbers so that the letters arranged accordingly form a meaningful word.
$R, T, A, O, U, H$
$1, 2, 3, 4, 5, 6$

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$. Below are given four alternatives containing combinations of these numbers. Select the combination of numbers so that the letters arranged accordingly form a meaningful word.
$T, R, I, F, U$
$1, 2, 3, 4, 5$