Methods of Preparation of Alcohols
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322915 Oxymercuration-demercuration reaction of 1methylcyclohexene gives

1 cis-2-Methylcyclohexanol
2 trans-2-Methylcyclohexanol
3 1-Methylcyclohexanol
4 Mixture of cis-and trans-2- methylcyclohexanol
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322916 The hydroboration of an alkene is carried out, then on oxidation with hydrogen peroxide, the alcohol so obtained is achiral. Possible structure of alkene is (are) :
(i) 2, 3-Dimethylbut-2-ene.
(ii) 3, 4-Dimethylbut-3-ene
(iii) 2-Methyl-but-2-ene
(iv) 2-Methylpropene.

1 (i) and (iv)
2 (iii) and (iv)
3 (ii) and (iii)
4 (i) and (iii)
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322917 Which of the following statement(s) is/are correct about hydroboration oxidation?

1 Diborane reacts with alkenes to give trialkyl boranes as an addition product which is oxidized to alcohol by \(\mathrm{H}_{2} \mathrm{O}_{2}\) in the presence of aqueous NaOH .
2 The alcohol so formed can also be obtained by the addition of water to the alkene by Markovnikov's rule.
3 Alcohol is obtained in poor yield.
4 All of the above
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322918 Read Assertion and Reason carefully to mark the correct option given below.
Assertion :
Commercially, acids are reduced to alcohols by converting them to esters followed by their reduction using catalytic hydrogenation.
Reason :
They can also reduce carboxylic acids to primary alcohols but the reagent used is expensive and is only used for preparing special chemicals.

1 Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
3 Assertion is true but Reason is false.
4 Assertion is false but reason is true.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322915 Oxymercuration-demercuration reaction of 1methylcyclohexene gives

1 cis-2-Methylcyclohexanol
2 trans-2-Methylcyclohexanol
3 1-Methylcyclohexanol
4 Mixture of cis-and trans-2- methylcyclohexanol
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322916 The hydroboration of an alkene is carried out, then on oxidation with hydrogen peroxide, the alcohol so obtained is achiral. Possible structure of alkene is (are) :
(i) 2, 3-Dimethylbut-2-ene.
(ii) 3, 4-Dimethylbut-3-ene
(iii) 2-Methyl-but-2-ene
(iv) 2-Methylpropene.

1 (i) and (iv)
2 (iii) and (iv)
3 (ii) and (iii)
4 (i) and (iii)
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322917 Which of the following statement(s) is/are correct about hydroboration oxidation?

1 Diborane reacts with alkenes to give trialkyl boranes as an addition product which is oxidized to alcohol by \(\mathrm{H}_{2} \mathrm{O}_{2}\) in the presence of aqueous NaOH .
2 The alcohol so formed can also be obtained by the addition of water to the alkene by Markovnikov's rule.
3 Alcohol is obtained in poor yield.
4 All of the above
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322918 Read Assertion and Reason carefully to mark the correct option given below.
Assertion :
Commercially, acids are reduced to alcohols by converting them to esters followed by their reduction using catalytic hydrogenation.
Reason :
They can also reduce carboxylic acids to primary alcohols but the reagent used is expensive and is only used for preparing special chemicals.

1 Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
3 Assertion is true but Reason is false.
4 Assertion is false but reason is true.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322915 Oxymercuration-demercuration reaction of 1methylcyclohexene gives

1 cis-2-Methylcyclohexanol
2 trans-2-Methylcyclohexanol
3 1-Methylcyclohexanol
4 Mixture of cis-and trans-2- methylcyclohexanol
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322916 The hydroboration of an alkene is carried out, then on oxidation with hydrogen peroxide, the alcohol so obtained is achiral. Possible structure of alkene is (are) :
(i) 2, 3-Dimethylbut-2-ene.
(ii) 3, 4-Dimethylbut-3-ene
(iii) 2-Methyl-but-2-ene
(iv) 2-Methylpropene.

1 (i) and (iv)
2 (iii) and (iv)
3 (ii) and (iii)
4 (i) and (iii)
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322917 Which of the following statement(s) is/are correct about hydroboration oxidation?

1 Diborane reacts with alkenes to give trialkyl boranes as an addition product which is oxidized to alcohol by \(\mathrm{H}_{2} \mathrm{O}_{2}\) in the presence of aqueous NaOH .
2 The alcohol so formed can also be obtained by the addition of water to the alkene by Markovnikov's rule.
3 Alcohol is obtained in poor yield.
4 All of the above
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322918 Read Assertion and Reason carefully to mark the correct option given below.
Assertion :
Commercially, acids are reduced to alcohols by converting them to esters followed by their reduction using catalytic hydrogenation.
Reason :
They can also reduce carboxylic acids to primary alcohols but the reagent used is expensive and is only used for preparing special chemicals.

1 Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
3 Assertion is true but Reason is false.
4 Assertion is false but reason is true.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322915 Oxymercuration-demercuration reaction of 1methylcyclohexene gives

1 cis-2-Methylcyclohexanol
2 trans-2-Methylcyclohexanol
3 1-Methylcyclohexanol
4 Mixture of cis-and trans-2- methylcyclohexanol
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322916 The hydroboration of an alkene is carried out, then on oxidation with hydrogen peroxide, the alcohol so obtained is achiral. Possible structure of alkene is (are) :
(i) 2, 3-Dimethylbut-2-ene.
(ii) 3, 4-Dimethylbut-3-ene
(iii) 2-Methyl-but-2-ene
(iv) 2-Methylpropene.

1 (i) and (iv)
2 (iii) and (iv)
3 (ii) and (iii)
4 (i) and (iii)
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322917 Which of the following statement(s) is/are correct about hydroboration oxidation?

1 Diborane reacts with alkenes to give trialkyl boranes as an addition product which is oxidized to alcohol by \(\mathrm{H}_{2} \mathrm{O}_{2}\) in the presence of aqueous NaOH .
2 The alcohol so formed can also be obtained by the addition of water to the alkene by Markovnikov's rule.
3 Alcohol is obtained in poor yield.
4 All of the above
CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322918 Read Assertion and Reason carefully to mark the correct option given below.
Assertion :
Commercially, acids are reduced to alcohols by converting them to esters followed by their reduction using catalytic hydrogenation.
Reason :
They can also reduce carboxylic acids to primary alcohols but the reagent used is expensive and is only used for preparing special chemicals.

1 Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
3 Assertion is true but Reason is false.
4 Assertion is false but reason is true.