Step 1: Calculate the total premium on redemption:
The debentures are redeemable at a premium of \(10\%\), so the premium on redemption is:
\[
{Premium on Redemption} = 10,000 \times Rs.10 = Rs.1,00,000.
\]
Step 2: Calculate the total premium received on issue:
The debentures were issued at a premium of \(5\%\), so the premium received on issue is:
\[
{Premium on Issue} = 10,000 \times Rs.5 = Rs.50,000.
\]
Step 3: Calculate the loss on issue of debentures:
The loss on issue of debentures is the difference between the premium on redemption and the premium received on issue:
\[
{Loss on Issue} = Rs.1,00,000 - Rs.50,000 = Rs.1,00,000.
\]
Conclusion:
The loss on issue of debentures account will be debited by \( Rs.1,00,000 \).