Haloalkanes and Haloarenes

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