Which molecules are achiral and chiral?

#CH_2BrF#
#H_2C=CHCF_3#
#HPCIBrCH_3^+#
#Br_3C CHClBr#
#H_3C CH_2F#
#H_3CF#
#H_3C CHBrCH_2CH_3#
#PCl_2BrCH_3^+#

Answer 1

Chiral molecules are molecules that CANNOT be superimposed on their mirror image.

#H_2CBrF# is achiral.
#H_2C=CHCF_3# is achiral.
#Br_3C-C^("*")H(Cl)Br# has a chiral centre (starred), and could support a pair of optical isomers.
#H_3C-CH_2F# is achiral.
#H_3CF# is achiral.
#H_3C-""^("*")C(H)(Br)CH_2CH_3# is chiral.
#""^+PBrCl_2(CH_3)# is achiral.
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Answer 2

Achiral molecules have a plane of symmetry and include molecules like methane (CH4) and carbon tetrachloride (CCl4). Chiral molecules lack a plane of symmetry and include molecules like chloroform (CHCl3) and 2-bromobutane (CH3CHBrCH2CH3).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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