Questions asked by Tirtha

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• A wave represented by the equation Y =a cos (kx-omega t) is superposed with another wave to form a stationary wave such that the point x =0 is a node.What is the equation of the Other wave? ........ ANS:-acos(kx+omega t)
  
• In a closed organ pipe of length 105 centimetres standing waves are setup corresponding to 3rd overtone. What distance from the closed end a pressure node is formed? ANS:15 cm
  
• [CH3CCH in presence of H2O, H2 s o4 and mercuric sulphate] What is the mechanism of formation of intermediate and product of the reaction? ANS:The intermediate is acetone and product is propnaldehyde
  
• Benzene is passed through Na in NH3 solution then the major product was passed through ozone and Zn-H2O solution then the product of it was passed through Zn-Hg in conc.HCl solution to give a product. What and how is the product formed? ANS:propane
  
• 1-aldo-2-methylcyclohex-1-ene is passed through n2h4 in H2O 2 solution. The product is 1-aldo-2-methylcyclohexane with the syn addition of hydrogen atoms. Why the hydrogen atoms are added from the same side?
  
• In which of the following dehydration by concentrated H2 S o4 no rearrangement is favourable? Options (1) Cyclopropylmethanol (2) cyclobutylmethanol (3) cyclohexylmethanol (4)2,2-dimethylhexanol ANS:(1)
  
• For derivation of equation for stationary wave, y1=Asin(kx-omega t) and y2=Asin(kx+omega t) are considered. Why y1=Asin (kx-omega t) and y2=Asin(kx+omega t+pi) cannot be used to derive?