What is the problem behind this ..

Hi Saravanankrishnagowdu. It's showing symptoms of Iron Deficiency . Click on green link for checking symptoms and taking control measures from Plantix library. Also need to apply good amount of Farm Yard manure or Vermicompost to get good growth. Don't do overwatering and direct watering on plant. Even don't allow soil to become water logged. Make a hole below the pot to drain out excessive water from the pot. Try and take care of your plant well.