Select the correct indirect form of the given sentence.Mr Khanna said…

The correct answer is Option (2) → Mr Khanna asked his son whether he did not have a maths test on Monday.

Changing a negative question into indirect speech:

Change	Direct	Indirect	Why
Reporting verb	said to his son	asked his son	Mr Khanna puts a question. So “said to” becomes “asked”.
Joining word	“ ” (quotation marks)	whether	The question is answered with yes or no, so “whether” joins it.
Word order	Don’t you have	he did not have	The question becomes a plain statement. The subject “he” comes first, and “not” stays with the verb.
Tense change	don’t ... have	did not have	“Don’t ... have” is in the simple present. The simple present is formed with the base form (V1), or V1 + s / es with he, she, it. After the past “said” it becomes the simple past “did not have”. The simple past is formed with the past form of the verb (V2).
Pronoun change	you	he	The son is spoken to, so “you” becomes “he”.
Full sentence	Mr Khanna said to his son, “Don’t you have a maths test on Monday?”	Mr Khanna asked his son whether he did not have a maths test on Monday.

Negative questions with “haven’t” or “isn’t” change in the same way. Example: Leela said to me, “Haven’t you met Arun?” → Leela asked me whether I had not met Arun.

Why the Other Options are Incorrect?

Option 1: Mr Khanna asked his son whether didn’t he have a maths test on Monday. — Incorrect. “Didn’t he have” keeps the question word order. In indirect speech the subject comes first: “he did not have”.

Option 3: Mr Khanna asked his son whether he does not have a maths test on Monday. — Incorrect. “Does not have” is still in the simple present. After the past reporting verb it becomes “did not have”.

Option 4: Mr Khanna asked his son that whether he did not have a maths test on Monday. — Incorrect. “That whether” puts two joining words together. A yes/no question takes “whether” alone.