The decreasing order of nucleophilicity for the following anions is CH3C$${\text{O}}_2^ - $$, CH3O-, C6H5O-, N$${\text{O}}_3^ - $$

The most appropriate sequence of the reactions for carrying out the following conversion
Basics of Organic Reaction Mechanism mcq question image

Which of the following compounds is expected to show a sharp singlet for one of its protons at δ ≥ 8 ppm in 1H NMR spectrum, given that this signal remains unaffected on shaking the solution thoroughly with D2O?

Conversion of Ph-NH2 into Ph-CN can be accomplished by

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