Can you give me some explanations of these questions?

12. What is the major product for the following reaction? on 1. NaH ? 2. D20 atron foolhante a. b. d. . D OD OD OD 14. Arrange the following compounds in order of decreasing reactivity in electrophilic substitution? NO2 HN CHO 'N Br III IV a. I > IV > Il > V > III d. V > IV > I > Il > III IV > Il > V > III > | e. IV > V > Il > III > 1 c. I > Ill > V > II > IV 10. Which of the following products is not expected in the reaction? Me NaNH2 Ph m NH3 CI A B D E Me Me Me Me Ph Ph. Ph NH2 Ph my All products are expected NH2 H2N NH2 5. Arrange the following carbocations in the order of expected Increasing stability: IV c. I