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8. Which conformation of cyclohexane has a C3 axis of symmetry? a. Boat b. Twist boat c. Chair d. Envelope The chair conformation of cyclohexane possesses a C3 axis of […]

7. Nucleophilic attack will be most facile on a. CH2=CF2 b. CH2=CCl2 c. CF2=CF2 d. CH2=CH2 Nucleophilic Attack on Alkenes: CH2=CF2 Most Facile Nucleophilic attack occurs most readily on CH2=CF2 […]

6. The correct shape of the [TeF5]– ion on the basis of VSEPR theory is a. trigonal bipyramidal b. square pyramidal c. pentagonal planar d. see-saw The correct shape of […]

5. In an enzyme-catalysed reaction, if [S] = 10 KM the velocity of the reaction is about: a. 0.9 Vmax b. 0.7 Vmax c. 0.5 Vmax d. 0.1 Vmax Introduction […]

4. What type of impurity atoms are used to increase the number of conduction band electrons in intrinsic silicon? a. bivalent b. trivalent c. tetravalent d. pentavalent Pentavalent Impurity Atoms […]

3. The IR stretching frequency for C=O stretching in carboxylic acid chlorides, esters amides, and acid anhydrides generally ranks as: a. Acid chlorides> esters> acid anhydrides> amides b. Amides> esters> […]

2. When 1 litre of 1 M NaCl solution in water is mixed with 1 litre of 1M CaCl2 solution in water, what is the total concentration of chloride ions […]

1. What is the relationship between the following pair of chemical entities? a. diastereomer b. enantiomer c. tautomer d. conformer They represent two different conformations (conformers) of the same molecule, […]

15. A random walker steps by a unit to the right with probability p, by a unit to the left with probability q, and stays at the same site with […]

14. A system consists of molecules that can be in one of two energy levels, E1 and E2>E1. At a temperature T, what fraction of the molecules are in energy […]