1. "A stone's throw" is generally treated as an idiom. Without the preceding "a", "stone's throw" is not acceptable. Literally it means the distance that one gets by throwing a stone. Figuratively, it means "a very short distance away". So the expression is usually in the singular. 2. "Men's plans" is already plural possessive. 3. "It's place" is not a possessive. "'s" here is "is". ITS possessive is "its place". The plural is "their place(s)". 4. The right singular is "a woman's plans". The plural is "women's plans".
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