Assertion (A): Addition reaction is a characteristic property of alkenes

Reason (R): Alkenes are double bond compounds.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

The type of bonding present in the hydrogen chloride molecule:

1. Ionic bond
2. Double covalent bond
3. Polar covalent bond
4. Triple covalent bond

The catalyst preferred in Haber's process is:

1. Finely divided iron
2. Graphite
3. Vanadium pentoxide
4. Platinum

The gas evolved when concentrated sulphuric acid reacts with zinc

1. Sulphur dioxide
2. Carbon dioxide
3. Hydrogen sulphide
4. Hydrogen