Find the word with the appropriate similar meaning of

In the following question select the answer pair that expresses a relationship most similar to that expressed in the capitalised pair.

A person pretending to be somebody he isn't

 Fill in the blanks with the appropriate antonym of the word in Italic from the options given:

He reels (A) off a series of allegation (B) , most of which have either been positively discredited (C) or remain wholly unsubstantiated (D) .

Select the option that is NOT an antonym of a word by way of adding the prefix 'in-'.

Choose the correct synonym for the given word. 

Renewal 

Select the most appropriate meaning of the given idiom

Once in a blue moon

Choose the most appropriate antonym of the given word  

METICULOUS

Complete the sentences given in List-I with the appropriate words given in List-II :

The money was left by a philanthropist to build a hospital ward.