explain in detail.

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22. Which of the following thermal reactions does not need a catalyst? (A) hydrogenation of isoproylene (B) hydration of acetylene (C) cis-trans isomerization of 2-butene (D) Wolff-Kishner reduction of acetone hydrazone (E) Cope rearrangement of 3-methyl-1,5-hexadiene 23. Which of the following reagents would not convert an alkene to an alcohol? (A) Br2, H20 (B) (1) Hg(OAc)2, H20; (2) NaBHA (C) 1) MCPBA; 2) H307 (D) 1) O3; 2) CH3SCH; (E) 1) BH3-THF; 2) H2O2, NaOH 24. How many of the following reactions give enantiomeric pairs as major products? Н. 1) MeMgBr NBS (1) Pt (ii) 2) H30* (iii) hv Et Br NaBH Меон HCECO Na (iv) (A) 1 (B) 2 (C)3 (D) 4 (E) 5 (v) 25. Which type of reaction accounts for the oxidation of a primary alcohol to an aldehyde? (A) Substitution (B) Addition (C) Elimination (D) Rearrangement (E) Chain reaction