Haloalkanes and...

Cyanide anion has two atoms th at have lone pair of electrons. Either could act as nucleophile in the reaction. Yet in the vast majority of the cases, carbon acts as nucleophile and forms a bond to the substrate, why?

In the following two phase reaction, catalyst works by

C₆H₅CH₂Br + KCN  C₆H₅CH₂CN + KBr

Which of the following would react most rapidly with sodium ethoxide to produce an ether?

In the given reaction,

X will be

In the given reaction,

X will be

Consider the following reaction,

Q. 

What can be correctly predicted regarding this reaction?

Pick out the alkyl bromide which proceeds with retention of configuration in an S_N2 reaction with CH₃ONa (aq).

For the following reaction, pick out the best term which describe its mechanism

The reaction of tert butyl bromide with sodium methoxide produces mainly

Which of the following undergoes nucleophilic substitution exclusively by S_N1 mechanism?

The increasing order of nucleophilicity would be?

Which of the following is most reactive towards SN1 reaction?

CH₃CH₂CH₂Br + NaCN → CH₃CH₂CH₂CN + NaBr, will be fastest in

Comprehension Type

Direction (Q. Nos. 14-16) This section contains a paragraph, describing theory, experiments, data, etc.
Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

Nucleophiles which have more than one type of donor atoms within the same donor group are known as ambident nucleophile e.g.
CN^- : Both carbon and nitrogen are donor.
OCN^- : Both oxygen and nitrogen are donor etc.
In case of free anionic and ambident nucleophiles, the better donor atom donate its lone pair of electron and forms bond with a-carbon after substitution reaction, in a given period, donor ability decreases from left to right. In a group, donor ability increases from top to bottom.

Q. 

When CH₃CH₂Br is treated with aqueous NaCN, CH₃CH₂CN is formed while CH₃CH₂NCis formed when AgCN is used in the similar reaction. It is due to

Nucleophiles which have more than one type of donor atoms within the same donor group are known as ambident nucleophile e.g.
CN^- : Both carbon and nitrogen are donor.
OCN^- : Both oxygen and nitrogen are donor etc.
In case of free anionic and ambident nucleophiles, the better donor atom donate its lone pair of electron and forms bond with a-carbon after substitution reaction, in a given period, donor ability decreases from left to right. In a group, donor ability increases from top to bottom.

Q. 

Treatment of CH₃CH₂Br with either NaNO₂ or AgNO₂ gives the same nitroethane as major product because

Nucleophiles which have more than one type of donor atoms within the same donor group are known as ambident nucleophile e.g.
CN^- : Both carbon and nitrogen are donor.
OCN^- : Both oxygen and nitrogen are donor etc.
In case of free anionic and ambident nucleophiles, the better donor atom donate its lone pair of electron and forms bond with a-carbon after substitution reaction, in a given period, donor ability decreases from left to right. In a group, donor ability increases from top to bottom.

Q. 

When iodomethane is treated with sodium isocyanate (NaNCO), CH₃NCO is the major product while AgNCO gives CH₃CH₂OCN as major product because

A Grignard reagent may be made by reacting magnesium with

C-Cl bond of chlorobenzene in comparison to C-Cl bond in methyl chloride is

Match the Column I with Column II and mark the correct option from the codes given below.