How many meaningful words can be made from the letters $ACER$ using each letter only once?

Arrange the given words in the sequence in which they occur in the dictionary and then choose the correct sequence.
$1.$ Dissipate $2.$ Dissuade $3.$ Disseminate $4.$ Distract $5.$ Dissociate $6.$ Dissect

$A$ 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.
$A, E, H, R, K, N$
$1, 2, 3, 4, 5, 6$

If the last four letters of the word $CONCENTRATION$ are written in reverse order,followed by the next two in reverse order,the next three in reverse order,and finally the first four in reverse order,which letter would be the eighth in the new arrangement,counting from the end?

Arrange the given words in alphabetical order and choose the one that comes first.
Problem,Probe,Proclaim,Probate,Proceed

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