Consider the structures of the three cyclic carbon compounds A, B and C given below and select the correct option from the following:

1. A and C are isomers of hexane and B is benzene.
2. A is an isomer of hexane, B is benzene and C is an isomer of hexene.
3. A is a saturated cyclic hydrocarbon and B and C are unsaturated cyclic hydrocarbons.
4. A is cyclohexane and B and C are the isomers of benzene.

The table below has information regarding pH and the nature (acidic/basic) of four different solutions. Which one of the options in the table is correct ?

An organism which breaks down the food material outside the body and then absorbs it is

1. a plant parasite, Cascuta
2. an animal parasite, Tapeworm
3. a bacteria, Rhizobium
4. a fungi, Rhizopus

A metal 'X' is used in thermite process. When X is burnt in air it gives an amphoteric oxide 'Y'. 'X' and 'Y' are respectively :

1. Fe and Fe₂O₃
2. Al and Al₂O₃
3. Fe and Fe₃O₄
4. Al and Al₃O₄