50. In the reaction SnCl, + 2CH SnCI, +2e the Lewis acid is 1) SnCl 2) SnCl, 3)SnCl, 4) SnCl, 51. Which of the following is not Lewis base? 1) CH, 3) Acctone 52. Among the following is strong Lewis base? 2) CH,OH 4) Sec. Amine 1) NF, 2) NCI, 3) NBr, 4) NI, 53. Which of the following is strong Lewis acid? 1) K* 54. The Lewis acidic strength of So, when compared to So, is 1) Equal 2) Less 3) More 4) Can not be predicted 55. Which of the following acts as Lewis acid? 1) Cu , 4) All 56. Among the following which one acts as Lewis base? 2) Ca 3) A 4) All 2) AICI, 3)CO, 1) C,H, 2) C,H, 3) Pyridine 4) All 57. The no. of conjugate acid-base pairs present in the aqueous solution of H,PO, is 1) 2 2) 3 3) 4 4) 5