Reactions of Alkyl halides

Question 1

The reactivity of alkyl halides is due to the?

Answer 1

polarity of C-X bond

Question 2

Name some Nucleophiles

Answer 2

OH⁻ , RO⁻ , HS−, CN−, NH3 , NH−2 , RCOO−

Question 3

What are the two mechanisms of Nucleophilic substitution reactions?

Answer 3

SN1 (Substitution Nucleophilic unimolecular) and SN2 (Substitution Nucleophilic bimolecular)

Question 4

How many steps are in SN1 mechanism?

Answer 4

2

Question 5

How many steps are in SN2 mechanism?

Answer 5

1

Question 6

In which mechanism a transition state is formed and is only a one step mechanism?

Answer 6

SN2

Question 7

SN1 is a mechanism of how many steps ?

Answer 7

2

Question 8

the slow step is called ?

Answer 8

Rate determining step

Question 9

3° alkyl halides undergo which mechanism?

Answer 9

SN1

Question 10

2° Alkyl halides undergo which mechanism?

Answer 10

both SN2 and SN1 depending upon the nature of the solvent in which reaction is carried out

Question 11

1° alkyl halides undergo which mechanism?

Answer 11

SN2

Question 12

CH3-X undergo which mechanism?

Answer 12

SN2

Question 13

polar solvents favor which mechanism?

Answer 13

SN1

Question 14

non polar solvents favor which mechanism?

Answer 14

SN2

Question 15

formation of Grignard’s reagent

Answer 15

R-X + Mg in the presence of anhydrous ether —> R-Mg-X

Question 16

the positively charged part in Grignard’s reagent is

Answer 16

Mg metal is electrophilic in nature and is +ve in RMgX

Question 17

the negatively charged part of Grignard’s reagent is

Answer 17

R

Question 18

Hydrolysis of Grignard’s reagent forms?

Answer 18

R-Mg-X + H-OH —> R-H + Mg-X-OH (alkane formation)

Question 19

Reaction of Grignard’s reagent with alcohol
R-Mg-X + R-OH —>

Answer 19

R-H + Mg-X-RO⁻
alkane

Question 20

Reaction of Grignard’s reagent with ammonia
R-Mg-X + H-N⁻H2 —>

Answer 20

R-H + Mg-X-N⁻H2
alkane

Question 21

Reaction of Grignard’s reagent with amine
R-Mg-X + R-N⁻H2 —->

Answer 21

R-R + Mg-X-N⁻H2
alkane

Question 22

Reaction of Grignard’s reagent with alkyl halide
R-Mg-X + R-X —->

Answer 22

R-R + Mg-X2
alkane

Question 23

Reaction of Grignard’s reagent with CO2