What is the definition of a Lewis acid? A. any molecule or ion that can form a n

Question

What is the definition of a Lewis acid? A. any molecule or ion that can form a new covalent bond by accepting a pair of electrons to be shared. B. any molecule or ion that can form a new covalent bond by donating a pair of electrons to be shared. C. any molecule or ion that can form a new covalent bond by accepting a single electron to be shared. D. None of the above How many degrees of unsaturation are in the molecule C-4 H_4 O? A. 1 B. 2 C. 3 D. 4 What is the smaller cycloalkene that can twist into a trans ? A. Cyclohepene B. Cyclonomene C. D. Which type or is the most stable? A primary B. A secondary C. A tertiary D. None of the above Identity the Lewis acid in the following reaction. A) I B)II C)III D) IV Identify the Lewis base in the following reaction. A) I B) II C) III D) IV Which of the following compounds is nor a Lewis acid? A) AICI_3 B) HCl C) H_2O D) CBr_4

Explanation / Answer

Solution:

32. Defination of Lewis acid is any molecular or ion that can form new covalent bond by accepting electron pair from donar.

Ans: option A

33. Degree of unsaturation= 1/2(2+2*No of carbon molecules-No. of hydrogen molecules=1/2 (2 + 2x4 - 4 )=3

Ans: option C

34. After twisting of cycloalkene for trans configuration,possibility for formation of achiral conformations. When the chain connecting the ends of the double bond is short, as in trans- cyclooctene, steric hindrance and steric strain prevent easy formation of planar conformations.

Ans: option C

35. The tertiary carbocation is the most stable because it is surrounded by three other carbon atoms that share the burden of its positive charge.

Ans: option C

36. Reaction= FeBr3 is lewis acid which accepts a pair of electron from Br

Ans: option B

37. Br2 is lewis base because it donates a pair of electron.

Ans: option A

38. For HCl is a classical acid, but not a Lewis acid; H+ is a Lewis acid when it forms an adduct with a Lewis base.

H20 can act as an acid by donating its proton to the base and thus becoming its conjugate acid, OH-. also H20 can also act as a base by accepting a proton from an acid to become its conjugate base, H3O+

AlCl3 is a Lewis acid because it can accept a pair of electrons in reactions.

CBr4 is lewis base

Ans: option B C D

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