(iii) Identify whether the compound shown in Figure 2 is chiral or achiral. Justify your answer. Br Br Figure 2 (iv) Draw all the stereoisomers of 2,3-difluorobutane.
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Chemistry (2023) Q1B2
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- To the following statement, answer true or false and explain your answer. Q)To be meso, a molecule must have at least two chiral centersPlease draw this structure in wedge-dash and identify chiral centers and determine stereochem of a compound that contains a cyclohexaneTo the following statement, answer true or false and explain your answer. Q)All chiral molecules are optically active when pure.
- Assign the absolute configuration of all chiral centres in the compound in the image?To the following statement, answer true or false and explain your answer. Q) All chiral centers are also stereocenters.Most naturally occurring amino acids have chiral centers (the asymmetric a carbon atoms)that are named (S) by the Cahn–Ingold–Prelog convention (Section 5-3). The commonnaturally occurring form of cysteine has a chiral center that is named (R), however.(a) What is the relationship between (R)-cysteine and (S)-alanine? Do they have the oppositethree-dimensional configuration (as the names might suggest) or the same configuration?(b) (S)-Alanine is an l-amino acid (Figure 24-2). Is (R)-cysteine a d-amino acid or anl-amino acid?
- with a model of methane (CH4) can the mirror image be superimposed on the original (in regard to Chirality)Draw three-dimensional representations of the following compounds. Which have asymmetric carbon atoms? Which have no asymmetric carbons but are chiral anyway? Use your models for parts (a) through (d) and any others that seem unclear.1,3-dichloropropadiene(a) Draw the nine isomers having the formula C7H16 . (Hint: There is one structure with a seven-carbon chain, two structures with six-carbon chains [one is illustrated in the margin above], five structures with a five-carbon chain, and one structure with a fourcarbon chain.)(b) Identify the isomers of C7H16 that are chiral.
- To the following statement, answer true or false and explain your answer. Q)To be optically active, a molecule must have a chiral center.Is it possible for a meso compound to contain three chiral centers? Why or why not?A) How many stereocentres are present in the molecule? B) Is the molecule chiral? Does it contain planes of symmetry? Briefly explain using the evidence for your answer. C) Are the models you have just built enantiomers?