Question

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3. In which of the following molecules is the central atom surrounded by four electron domains? 1. Which of the functional groups are present in the following A only choice I B. only choice II C. choices I and lII D. choices Ill and IV E. choices I, Il and III A. amine and ether B. carboxylic acid and ketone C. amine, aldehyde, and carboxylic acid D. amine, ketone, and aldehyde E. ether, aldehyde, and ketone 2. What is the approximate bond angle (a) in this molecular structure? What is the molecular weight of a gas if 3.5 g of the gas occupies 2.1 L at STP? 4. A. 41 g/mol B. 5.5 x 10 g/mol C. 37 g/mol D. 4.6 x 102 g/mol E. 2.7 x 102 g/mol A. 90 B. 109.5 C. 120 D. 180 E. 60

Answer 1

Option D amine, ketone and aldehyde The COOH carbon has an trigonal loaner geometry. So bond angel is 120 degree. Option c right 20 degree Lewis structure (I) 2 electron domain as double binds are count as one domain 3 electron domains 4 electronic domain (bonding) 4 tronic domain (2 bonding + 2 long pain) So answer is (D) choice III and IV one mole of an ideal gas occupies 22.4 L volume at sTP. \r\n So number of moles of gas = 2.1 L/22.4 L = 0.094 mol therefore 0.094 mol gas corresponds to 3.5 g therefore 1 mol gas corresponds to 3.5 g/0.094 mol = 37.26 g therefore Answer is option C 37 g/mol.