Which of the following with reference to Indian States is/are not correct ? 1. Uttar Pradesh shares its boundary with the highest number of other Indian States. 2. Rajasthan shares the longest international border among all Indian States. 3. Sikkim is the only State that shares its boundary with just one other Indian State.

Statement 1 is correct: Uttar Pradesh shares its boundary with 8 Indian states (Uttarakhand, Himachal Pradesh, Haryana, Delhi, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, Bihar), the highest among all states. Statement 2 is incorrect: Rajasthan does not share the longest international border — Jammu & Kashmir/Ladakh has the longest border with neighbouring countries; among states, Gujarat has long international borders too. Actually the longest international border state is debated, but as per common UPSC reference it is not Rajasthan. Statement 3 is incorrect because Sikkim shares borders with West Bengal (only one Indian state), but Meghalaya borders only Assam, so Sikkim is not the ONLY such state. Hence statements 2 and 3 are not correct.