Simple Logic Puzzles

Anu is taller than Bobby. Bobby is taller than Chetan. Samar thinks this cannot decide who is taller between Anu and Chetan — one more piece of information is needed. His sister says it is already certain. Who is right?

It is true that "if it rains, the ground gets wet." In the morning, Meera sees the ground is wet, and immediately says "it must have rained last night." Her father says this cannot be said for certain. Who is right?

Three friends — Aarav, Beena, Chetan — sit on a bench left to right. Known: (1) Aarav is not on the far left. (2) Beena is not on the far right. Dev says these two clues fully fix the seating order — Chetan is on the far left. His sister says more than one order is still possible. Who is right?

The list is: apple, banana, carrot, orange. Vinay thinks "banana" is the odd one out, because the rest are round and banana is long. His teacher says the real "odd one out" is based on a different grouping. Who is right?