“The existence of a ‘substantial question of law’ is the sine qua non for the exercise of jurisdiction under Section 100. The principles for deciding when a question of law becomes a ‘substantial question of law’, have been enunciated by a Constitution Bench of this Court in Sir Chunilal V. Mehta & Sons Ltd. v. Century Spg. & Mfg. Co. Ltd., AIR 1962 SC 1314. Hero Vinoth v. Seshammal, (2006) 5 SCC 545 summarized the tests. To be ‘substantial’, a question of law must be debatable, not previously settled by the law of the land or any binding precedent, and must have a material bearing on the decision of the case and/or the rights of the parties before it, if answered either way.
The paramount overall consideration is the need for striking a judicious balance between the indispensable obligation to do justice at all stages and the impelling necessity of avoiding prolongation in the life of any lis. This proposition finds support from Santosh Hazari v. Purushottam Tiwari, (2001) 3 SCC 179.
An entirely new point, raised for the first time, before the High Court, is not a question involved in the case, unless it goes to the root of the matter.
When no ‘substantial question of law’ is formulated, but a ‘second appeal’ is decided by the High Court, the Judgment of the High Court is vitiated in law, as held by this Court in Biswanath Ghosh v. Gobinda Ghose, AIR 2014 SC 152.”
– Hon’ble Justice Indira Banerjee, Nazir Mohamed v. J. Kamala, [Civil Appeal Nos. 2843-2844 of 2010].