ANSWER : B55A

Explanation : . Similar pairs of letters have been given the same numeric in each word. As a result pair UE in word QUEUE has been coded 2, pair CH has been coded 1 and likewise the pair AN has been coded 5. Hence, the word BANANA would be coded as B55A.

ANSWER : MIRLACSE

Explanation : . First three letter of the word are kept as they are sixth letter comes at fourth place shifting fourth and fifth letters to fifth and sixth places, respectively and the last two letters are exchanged.

ANSWER : CQJFIS

Explanation : . Letters at the odd places in the coded word are one letter ahead of the respective letters of the basic word, and letters at the even places in the coded word are one letter back of the respective letters as their positions in the alphabet.

ANSWER : HQFZUMFRT

Explanation : . Letters at odd places in the coded word are one letter ahead of the letters in the basic word, and letters at even places are one letter behind of the letters in the basic word as their positions in the alphabet.

ANSWER : None of these

Explanation : . In the coded word, first three letters are reversed, then next two letters are reversed, then again two letters are reversed, and finally three letters are reversed. Hence, PRODUCED will be coded as ORPUDDEC.