Haloalkanes and Haloarenes · Question 19

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