Haloalkanes and Haloarenes

The following two reactions give the same foul smelling product Z. [figure] X and Z, respectively, are :

1. X = AgCN; Z = C2H5CN
2. X = AgCN; Z = C2H5NC
3. X = KCN; Z = C2H5CN
4. X = KCN; Z = C2H5NC

In the following reaction sequence, X and Z, respectively are : CH3CH2CH2-OH + PCl5 CH3CH2CH2Cl + X + HCl [figure]

1. X = POCl3; Z = [figure]
2. X = POCl3; Z = CH3CH2CH2-Br
3. X = H3PO3; Z = [figure]
4. X = H3PO3; Z = CH3CH2CH2-Br

One of the products formed in the following reaction is [figure]

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below:

1. A is true but R is false
2. A is false but R is true
3. Both A and R are true and R is the correct explanation of A
4. Both A and R are true but R is not the correct explanation of A

The compound that will undergo SN1 reaction with the fastest rate is

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Major products A and B formed in the following reaction sequence, are [figure]

1. [figure]
2. [figure]
3. [figure]
4. [figure]

The major product C in the below mentioned reaction is: CH3CH2CH2Br [ ]alc. KOH A HBr B [ ]aq. KOH C

1. Propan-1-ol
2. Propan-2-ol
3. Propane
4. Propyne

The following reaction method [figure] is not suitable for the preparation of the corresponding haloarene products, due to high reactivity of halogen, when X is :

1. F
2. I
3. Cl
4. Br

The given compound [figure] is an example of .

1. aryl halide
2. allylic halide
3. vinylic halide
4. benzylic halide

Identify the final product [D] obtained in the following sequence of reactions. [figure]

1. [figure]
2. C4H10
3. HC C Na
4. [figure]

Which of the following sequence of reactions is suitable to synthesize chlorobenzene?

1. Benzene, Cl2, anhydrous FeCl3
2. Phenol, NaNO2, HCl, CuCl
3. [figure] , HCl
4. [figure] , HCl, Heating

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

1. (A) is not correct but (R) is correct
2. Both (A) and (R) are correct and (R) is the correct explanation of (A)
3. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
4. (A) is correct but (R) is not correct

Predict the order of reactivity of the following four isomers towards SN2 reaction. (I) CH3CH2CH2CH2Cl (II) CH3CH2CH(Cl)CH3 (III) (CH3)2CHCH2Cl (IV) (CH3)3CCl

1. (IV) > (II) > (III) > (I)
2. (IV) > (III) > (II) > (I)
3. (I) > (II) > (III) > (IV)
4. (I) > (III) > (II) > (IV)

The major product formed in dehydrohalogenation reaction of 2-bromopentane is pent-2-ene. This product formation is based on?

1. Hückel's Rule
2. Saytzeff's Rule
3. Hund's Rule
4. Hofmann Rule

The correct sequence of bond enthalpy of 'C-X' bond is :

1. CH3-Cl > CH3-F > CH3-Br > CH3-I
2. CH3-F < CH3-Cl < CH3-Br < CH3-I
3. CH3-F > CH3-Cl > CH3-Br > CH3-I
4. CH3-F < CH3-Cl > CH3-Br > CH3-I

Elimination reaction of 2-Bromopentane to form pent-2-ene is :

1. A, C and D only
2. B, C and D only
3. A, B and D only
4. A, B and C only

The compound C7H8 undergoes the following reactions : C7H8 3Cl2/ A Br2/Fe B Zn/HCl C The product 'C' is

1. m-bromotoluene
2. o-bromotoluene
3. 3-bromo-2,4,6-trichlorotoluene
4. p-bromotoluene

Identify A and predict the type of reaction. [figure]

1. [figure] and elimination addition reaction
2. [figure] and cine substitution reaction
3. [figure] and cine substitution
4. [figure] and substitution reaction

Consider the reaction, CH3CH2CH2Br + NaCN CH3CH2CH2CN + NaBr The reaction will be the fastest in

1. ethanol
2. methanol
3. N,N-dimethylformamide (DMF)
4. water

Which of the following reaction(s) can be used for the preparation of alkyl halides? (I) CH3CH2OH + HCl Anh. ZnCl2 (II) CH3CH2OH + HCl Anh. ZnCl2 (III) (CH3)3COH + HCl Anh. ZnCl2 (IV) (CH3)2CHOH + HCl Anh. ZnCl2

1. (I) and (II) only
2. (IV) only
3. (III) and (IV) only
4. (I), (III) and (IV) only

In the replacement reaction [figure] The reaction will be most favourable if M happens to be

1. Na
2. K
3. Rb
4. Li

Which of the following compounds undergoes nucleophilic substitution reaction most easily?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Consider the reactions. (i) (CH3)2CH-CH2Br C2H5OH (CH3)2CH-CH2OC2H5 + HBr (ii) (CH3)2CH-CH2Br C2H5O- (CH3)2CH-CH2OC2H5 + Br- The mechanisms of reactions (i) and (ii) are respectively

1. SN1 and SN2
2. SN1 and SN1
3. SN2 and SN2
4. SN2 and SN1

Which one is a nucleophilic substitution reaction among the following ?

1. CH3-CH=CH2 + H2O H+ CH3- OH |CH-CH3
2. RCHO + R'MgX R- OH |CH-R'
3. CH3-CH2- CH3 |CH-CH2Br + NH3 CH3-CH2- CH3 |CH-CH2NH2
4. CH3CHO + HCN CH3CH(OH)CN

In the following reaction C6H5CH2Br [2. H3O+]1. Mg, ether X, the product 'X' is

1. C6H5CH2OCH2C6H5
2. C6H5CH2OH
3. C6H5CH3
4. C6H5CH2CH2C6H5

The reaction of toluene with Cl2 in presence of FeCl3 gives X and reaction in presence of light gives Y. Thus, X and Y are

1. X = Benzal chloride, Y = o-chlorotoluene
2. X = m-chlorotoluene, Y = p-chlorotoluene
3. X = o- and p-chlorotoluene, Y = Trichloromethyl benzene
4. X = Benzyl chloride, Y = m-chlorotoluene

Which one is most reactive towards SN1 reaction?

1. C6H5CH(C6H5)Br
2. C6H5CH(CH3)Br
3. C6H5C(CH3)(C6H5)Br
4. C6H5CH2Br

The correct order of increasing reactivity of [figure] C–X bond towards nucleophile in the following compounds is

1. I < II < IV < III
2. II < III < I < IV
3. IV < III < I < II
4. III < II < I < IV

Which of the following reactions is an example of nucleophilic substitution reaction?

1. 2RX + 2Na R-R + 2NaX
2. RX + H2 RH + HX
3. RX + Mg RMgX
4. RX + KOH ROH + KX

Trichloroacetaldehyde, CCl3CHO reacts with chlorobenzene in presence of sulphuric acid and produces

1. [figure]
2. [figure]
3. [figure]
4. [figure]