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Sentence Correction: Pronoun Questions - Ambiguity

John has a brother and he is tall.

Is the above sentence a correct GMAT sentence?

You're right! 

You're half right: the pronoun he indeed agrees with a former noun. The problem is that it agrees with more than one such noun. This creates an ambiguous sentence: it's not clear who is tall: John or his brother. Ambiguity is a GMAT mistake, albeit a stylistic mistake and not a grammatical one. 

The pronoun he agrees with more than one noun. This creates an ambiguous sentence: it's not clear who is tall: John or his brother. Ambiguity is a GMAT mistake, albeit a stylistic mistake and not a grammatical one.

Therefore, the correct answer is that grammatically, this sentence is correct, but stylistically it is incorrect as the pronoun he is ambiguous. It's not clear whether he refers to John or to his brother.

Yes. The pronoun he agrees with a former noun. 

Grammatically this sentence is correct, but stylistically it is incorrect as the pronoun he is ambiguous. It's not clear whether he refers to John or to his brother.

I don't know