(1) The energy difference between ground state and first excited state increases on descending the Group 17
(2) I2 conducts electicity to a small extent due to its self ionization 3I2⇋ I3+ + I-3
(3) Conductivity of I2 increases on increasing temperature
(4) The compounds Cn F2n+2 are known as perfluoro componds
(A)(2)and(3)(B)Only(3)(C)Only(1)(D)Only(4)
