Arrange benzene, n-hexane and ethyne in the decreasing order of acidic behaviour. Also give reason for this behaviour.

Arrange C, N, O and F in the decreasing order of their second ionisation enthalpy.

The substance which can accept electrons is a Lewis acid. 'BCl_3, BF_3' and 'BBr_3' are Lewis acids. a. Arrange the above Lewis acids in the increasing,order of their acid strength. b. Give reason for this order of acidic strength, c. The chemistry of boron is different from that of other members of the same group. Mention any two differences and give reason.

Arrange F, Cl, Br and I in the decreasing order of their negative electron gain enthalpy.

Give reason for anomalous behaviour in group 2.

Give reasons for the deviation of real gases from the ideal gas behaviour.

Arrange the following compounds in decreasing order of their basic character.

Arrange the following hydrogen halides in the Increasing order of their acidic strength. HI, HBr, HCI, HF.