MCQ
Methods used for purification of organic compounds are based on :
- Aneither on nature of compound nor on the impurity present.
- Bnature of compound only.
- ✓nature of compound and presence of impurity.
- Dpresence of impurity only.
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$(a)$ Methionine $(b)$ Isoleucine
$(c)$ Valine $(d)$ Cysteine
$(A)$ $\sigma$ orbital has a total of two nodal planes.
$(B)$ $\sigma^*$ orbital has one node in the $x z$-plane containing the molecular axis.
$(C)$ $\pi$ orbital has one node in the plane which is perpendicular to the molecular axis and goes through the center of the molecule.
$(D)$ $\pi^*$ orbital has one node in the $x y$-plane containing the molecular axis.