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Sentence Correction: if/whether (or not)

The more objective evidence a judge is presented with, the easier it is for that judge to decide if the suspect is guilty.

In the GMAT, the word if should be used in Conditionals only. Since in this question there is no condition, if should be replaced by whether.

Think of whether as a choice between two possibilities dealing with the same subject or as a yes/no question.

Example: I do not know whether this will work. (yes or no)

He was not sure whether he wanted banana or chocolate cake. (a choice between 2 possibilities)

Although this answer choice correctly uses whether instead of if, in the GMAT, the addition of the phrase or not at any point after the word whether is considered redundant.

Although this answer choice correctly uses whether instead of if, it is grammatically incorrect. This question uses a Double Comparative. The second part of a Double Comparative must begin with the word the. In this answer choice, however, it begins with the word it.

Although this answer choice correctly uses whether instead of if, it is grammatically incorrect. This question uses a Double Comparative. The second part of a Double Comparative must begin with the word the. In this answer choice, however, it begins with the word easier.

You've got it!

In the GMAT, the word if should be used in Conditionals only. Since in this question there is no condition, if  should be replaced by whether.

the easier it is for that judge to decide if the suspect is guilty
it is easier for that judge to decide whether the suspect is guilty
the easier it is for that judge to decide whether the suspect is guilty
easier it is for that judge to decide whether the suspect is guilty
the easier it is for that judge to decide whether the suspect is guilty or not