Preparation Of Cyanide And Isocynides

Front 1

From alkyl halides of cyanides

Back 1

Rx + kcn -----heat----> R--C € N + K X

Front 2

Methods by which cyanide are prepared

Back 2

Alkyl halides , Acid amides , aldoximes , grignard reagent , primary amine (A3GP)

Front 3

Method of preparation of isocyanide

Back 3

Alky halides

Primary amine ( carbylamine reaction )

Front 4

Alkyl haides can be prepared by by ....... of suitable acid amides in presence of ....... or .......

Back 4

dehydration

P2O5

Socl2

Front 5

A

Structure of aldoximes

Back 5

CH3--CH==NOH

Front 6

Alkyl isocyanide can be prepared by heating primary amines with ........... and .........

Back 6

Chloroform

KOH

Front 7

Lower alkyl cyanide upto c14 are .......... while higher membrane are .............. Solids.

Back 7

Colorless liquid

Crystalline solids

Front 8

........... are polar comp . Isocyanide have dipole moment .......... than cyanide.

Back 8

Cyanide

Less

Front 9

Due to polar nature cyanide and isocyanide ve ............. and their molecules are .......... Associated.

Back 9

Strong intermolecular dipole dipole interaction

2)highly

Hint 9

B.p is high bc of that

Front 10

Cn & Icn ve b.p more than alkyl halides of comparable mm . T or F

Back 10

T

Front 11

Lower alkyl cyanides are fairly soluble in water due formation of

Back 11

Hydrogen bond

Front 12

Alky group is .......... in nature .

Back 12

Hydrophobic

Front 13

With increase of alkyl group solubility increase : T or F

Back 13

F

Front 14

Alky halides are almost insoluble in water

Back 14

N atom in them does not posses lone of electron and is unable to form H bond with water.

Front 15

Nitriles can be hydrolysed by both .......... and ....... to give corresponding ........... AND .........

Back 15

1) Mineral acid and alkali

2) carboxylic acid and ammonia

Front 16

Intermediate formed during hydrolysis of nitrile

Back 16

Amide

Front 17

Iso cyanides are hydrolysed by ....... and not by ..........

Back 17

1) dilute acid

2) not by alkali

Front 18

Hydrolysis of isocyanide yield .........

Back 18

Primary amine and formic acid

Front 19

Isocyanide are hydrolysed bc N=C carbon atom ve .........charge and attract H+ electrophile from acids

Back 19

Negative

Front 20

Complete reduction of cyanides gives ...........

Back 20

Primary amine

Front 21

Complete reduction of alkali cyanides carried out by

Back 21

1) H2 in presence of Ni or pt

2) LiAlH chemical reduction

3) Na and alcohol ( Mendus reaction )

Front 22

Isocyanide on complete reduction gives ........

Back 22

Secondary amine

Front 23

Stephan partial reduction.

Back 23

Cyanide can be partially reduced to imine hydrochloride with stannous chloride and hydrogen chloride . imine chloride on boiling with watet forms aldehyde.

Front 24

Cyanide give ............. With grignard reagent.

Back 24

Imine salt on hydrolysis gives ketone s.

Front 25

Addition reaction is performed only by ............

Back 25

Isocyanides

Front 26

When alkyl cyanide is heated for long time ?

Back 26

Undergo isomeric rearrangement to form isomeric cyanides