Which of the following compounds will show an optical rotation when a sample of

Question

Which of the following compounds will show an optical rotation when a sample of the compound is placed in a polarimeter? (A) cyclohexane (B) R-2-butanol (C) racemic 2-butanol (D) meso-tartaric acid What is the major product formed when 2-bromo-2-methylpentane reacts with NaOH? Which of the following compounds will react fastest in the E2 elimination reaction with NaOH? (A) 2-methyl-2-bromopetane (B) 1-bromopentane (C) bromoethane (D) bromocyclohexane Which of the following compounds will react fastest in the El elemination in ethanol? A) 2-methyl-2-bromopentane B) 1-brompentane C) bromoethane D) bromocyclohexane Which of the following orbitals is the very lowest energy orbital of 1, 3-butadiene? Which of the following statements correctly describes the position of this acid-base equilibrium? (A) The products are present in much greater concentration than the reactants (B) The reactants are present in much greater concentration than the products (C) The anilinium ion is present in much greater concentration than the acetate iron. (D) The reactants and products are present in nearly equal concentrations with a slight abundance of the reactants.

Explanation / Answer

optical active coumponds rotates plane polarised light.

(A) is cyclohexane which is optical active.(contains symmetery elements)

(B) is R- 2-butanol as name clearly it is optically active coumpoundnand hecne it will rotate plane polarised light.

NOTE: racemic and meso coupounds does not rotate plane polarised light as meso compounds have plane of symmetry and racemic mixture has equal composition of R and S configuration which cancel outs the effect of rotation as if R configure rotates the light to left then S configure will rotate the light to right with same extent. hence cancel out out each other.

therefore option (C) and (D) are incorrect

and hence OPTION (B) IS CORRECT

please submit your different questions seperately.

thankyou and have a nice day

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