With reference to Indian history, consider the following statements: 1. The first Mongol invasion of India happened during the reign of Jalal-ud-din Khalji. 2. During the reign of Ala-ud-din Khalji, one Mongol assault marched up to Delhi and besieged the city. 3. Muhammad-bin-Tughlaq temporarily lost portions of north-west of his kingdom to Mongols. Which of the statements given above is/are correct?

1. Incorrect. The first Mongol incursions into India began earlier, during the Delhi Sultanate before Jalal-ud-din Khalji; they are noted from the time of Iltutmish/Balban era pressures, not first under Jalal-ud-din.

2. Correct. During Ala-ud-din Khalji’s reign, the Mongol attack led by Taraghai/Qutlugh Khwaja reached Delhi and effectively besieged the city in 1299.

3. Incorrect. Muhammad-bin-Tughlaq faced Mongol threats, but the statement that he temporarily lost parts of the north-west to Mongols is not accepted as correct in standard UPSC history framing.

Therefore, only statement 2 is correct.