Step 1: Understand the components.
Veebee Ltd. issued 20,000 debentures of \( ₹ 100 \) each. Despite being issued at a discount and redeemable at a premium, the interest is always calculated on the face value.
Step 2: Calculate face value and interest.
\[
\text{Face value of debentures} = 20,000 \times 100 = ₹ 20,00,000
\]
\[
\text{Interest @ 13%} = 13% \times 20,00,000 = ₹ 2,60,000
\]
Since debentures were issued on 1st April 2023, the full year's interest is applicable.
Final Answer:\
\( \boxed{₹ 2,60,000} \)