QBManager

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323646 Suitable reagent for conversion of following reaction
supporting img

1

{NaBH}_{4}

2

Ni / H_{2}

3

Zn / Hg / HCl

4 Red

P + HI

Explanation:

The suitable reagent for the conversion
${CH}_{2} = CH - CHO \overset{?}{\to} {CH}_{2} = CH - {CH}_{2} - OH$ is ${NaBH}_{4}$ . It is a selective reagent that reduces $> C = O$ group to $- OH$ and does not reduce carbon-carbon double bond. Thus, unsaturated alcohols can be prepared.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323647 In the reduction
$R - CHO + H_{2} ⟶ {RCH}_{2} OH$
the catalyst used is :

1

Ni

2

Pd

3

Pt

4 Any of these

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323648 The medium used in step - 1 and step - 2 are, respectively
supporting img

1 acidic, basic

2 basic, acidic

3 acidic, acidic

4 basic, basic

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323649 Assertion :
Mixture of benzaldehyde and acetaldehyde in hot alkaline medium gives cinnamaldehyde.
Reason :
Benzaldehyde is strong electrophile than acetaldehyde.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323646 Suitable reagent for conversion of following reaction
supporting img

1

{NaBH}_{4}

2

Ni / H_{2}

3

Zn / Hg / HCl

4 Red

P + HI

Explanation:

The suitable reagent for the conversion
${CH}_{2} = CH - CHO \overset{?}{\to} {CH}_{2} = CH - {CH}_{2} - OH$ is ${NaBH}_{4}$ . It is a selective reagent that reduces $> C = O$ group to $- OH$ and does not reduce carbon-carbon double bond. Thus, unsaturated alcohols can be prepared.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323647 In the reduction
$R - CHO + H_{2} ⟶ {RCH}_{2} OH$
the catalyst used is :

1

Ni

2

Pd

3

Pt

4 Any of these

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323648 The medium used in step - 1 and step - 2 are, respectively
supporting img

1 acidic, basic

2 basic, acidic

3 acidic, acidic

4 basic, basic

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323649 Assertion :
Mixture of benzaldehyde and acetaldehyde in hot alkaline medium gives cinnamaldehyde.
Reason :
Benzaldehyde is strong electrophile than acetaldehyde.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323646 Suitable reagent for conversion of following reaction
supporting img

1

{NaBH}_{4}

2

Ni / H_{2}

3

Zn / Hg / HCl

4 Red

P + HI

Explanation:

The suitable reagent for the conversion
${CH}_{2} = CH - CHO \overset{?}{\to} {CH}_{2} = CH - {CH}_{2} - OH$ is ${NaBH}_{4}$ . It is a selective reagent that reduces $> C = O$ group to $- OH$ and does not reduce carbon-carbon double bond. Thus, unsaturated alcohols can be prepared.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323647 In the reduction
$R - CHO + H_{2} ⟶ {RCH}_{2} OH$
the catalyst used is :

1

Ni

2

Pd

3

Pt

4 Any of these

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323648 The medium used in step - 1 and step - 2 are, respectively
supporting img

1 acidic, basic

2 basic, acidic

3 acidic, acidic

4 basic, basic

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323649 Assertion :
Mixture of benzaldehyde and acetaldehyde in hot alkaline medium gives cinnamaldehyde.
Reason :
Benzaldehyde is strong electrophile than acetaldehyde.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323646 Suitable reagent for conversion of following reaction
supporting img

1

{NaBH}_{4}

2

Ni / H_{2}

3

Zn / Hg / HCl

4 Red

P + HI

Explanation:

The suitable reagent for the conversion
${CH}_{2} = CH - CHO \overset{?}{\to} {CH}_{2} = CH - {CH}_{2} - OH$ is ${NaBH}_{4}$ . It is a selective reagent that reduces $> C = O$ group to $- OH$ and does not reduce carbon-carbon double bond. Thus, unsaturated alcohols can be prepared.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323647 In the reduction
$R - CHO + H_{2} ⟶ {RCH}_{2} OH$
the catalyst used is :

1

Ni

2

Pd

3

Pt

4 Any of these

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323648 The medium used in step - 1 and step - 2 are, respectively
supporting img

1 acidic, basic

2 basic, acidic

3 acidic, acidic

4 basic, basic

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323649 Assertion :
Mixture of benzaldehyde and acetaldehyde in hot alkaline medium gives cinnamaldehyde.
Reason :
Benzaldehyde is strong electrophile than acetaldehyde.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.