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

If it is possible to make a meaningful word out of the second,the fourth,the fifth and the eighth letters of the word $ILLOGICAL$,then which of the following will be the third letter of the so formed word? If more than one word can be formed,then give $X$ as the answer. If no meaningful word can be formed,then give $Z$ as the answer.

If in the word $CERTIFICATE$,the first and the seventh letters are interchanged,similarly the second and the eighth letters are interchanged and so on up to the fifth and eleventh letters are interchanged,then which letter will be third to the right of sixth from the right end?

The letters in the series are placed such that the number of letters skipped between adjacent letters increases by a constant value. Which of the following series observes this rule?

Choose one word out of the given alternatives,which cannot be formed from the letters of the word $CONSULTATION$.

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