Provide the missing reagents in this scheme. 
Definitions:
Pregnancy
The condition of having a developing embryo or fetus in the uterus, marked by various physical and hormonal changes in the body.
Maternal Cigarette Smoking
The act of smoking cigarettes by a mother, which can have harmful effects on fetal development and child health.
Miscarriage
The spontaneous loss of a pregnancy before the fetus can survive outside the womb, typically occurring before the 20th week of pregnancy.
Prematurity
The condition of being born before the completion of the normal term of pregnancy, often resulting in health challenges for the infant.
Q19: Which statement about this reaction is correct?
Q20: Which of the following compounds can be
Q22: Which of the following statements is true
Q23: What are the products of β cleavage
Q39: Which of the following compounds corresponds to
Q43: Predict the product of the following reaction.
Q47: What is the reverse of Markovnikov hydration,
Q49: Which of the following structures is the
Q62: Write a multistep synthesis for the following
Q64: Draw the products of the following reaction;