In the following questions a statement of Assertion (A) followed by a statement of reason

(R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : Boron has a smaller first ionisation enthalpy than beryllium.

Reason (R) : The penetration of a 2s electron to the nucleus is more than the 2p electron hence

2p electron is more shielded by the inner core of electrons than the 2s electrons.

(i) Assertion and reason both are correct statements but reason is not correct explanation

for assertion.

(ii) Assertion is correct statement but reason is wrong statement.

(iii) Assertion and reason both are correct statements and reason is correct explanation

for assertion.

(iv) Assertion and reason both are wrong statements.