How many meaningful English words can be formed with $ESRO$ using each letter only once in each word?

How many letters are there in the word $CREATIVE$ which have as many letters between them in the word as in the alphabet?

Study the letter series given below and answer the question that follows:
$H, D, Y, S, M, W, N, B, Q, P, O, C, R, T, B, L, Z, V, E, G, U, F$
Which letter has the same neighbours as in the alphabetical order,although they have changed places?

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

Arrange the given names in the order in which they would occur in a telephone directory and choose the one that comes in the middle.

Arrange the given words in alphabetical order and select the one that comes in the middle.
Rigour,Rumour,Remove,Revive,Retrospect