Haloalkanes and Haloarenes · Question 10

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