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Aldehydes Ketones

Solution for Class 12, Chemistry, Aldehydes Ketones

Question 1

The major product of the following reaction is

Topic:

Aldehydes & Ketones

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Question 2

14. Which of the following is reduced with Zinc and hydrochloric acid to give the corresponding hydrocorbon

{"A- Ethyl acetate","B- Acetic acid","C- Acetamide","D- butane- 2- one"}

Topic:

Aldehydes & Ketones

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Question 3

3) Hydration of alkyhes: (पानी हल्ग Alkynes react with

H_{2} O

in the presence of

H_{2} SO_{4}

and

Hg SO_{4}

then aldeliyde and ketove are formed.

eg: $CH_{3} - C \equiv CH + H_{2} O \frac{HgSO _{4}}{H _{2} SO _{4}} CH_{3} - 011 - CH_{3}$ ",ketone
egi- $CH_{3} - 1 CH_{3} - CH_{2} - C \equiv CH + H_{2} O H_{2} SO_{4} C SO_{3}$
$CH_{3} - CH_{3} C - 0 CH_{2} - 11 C - H_{3}$

Topic:

Aldehydes & Ketones

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Question 4

31. Give a possible explanation for each one of the following : (i) There are two -

NH_{2}

groups in semicarbazide. However, only one such group is involved in the formation of semicarbazones. (ii) Cyclohexanone forms cyanohydrins in good yield but

2, 2, 6

-trimethyl cyclohexanone does not. Delhi 2012

Topic:

Aldehydes & Ketones

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Question 5

When formaldehyde reacts with

NH_{3}

, then which of the following compounds is formed?

Formaldehyde ammonia
Hexamethylene tetramine
Formalin
Methylamine

Topic:

Aldehydes & Ketones

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Question 6

Short sinswer Type Ouestions

(2 \times 5 = 10)

Describe Aldol Condensation.
What is Tollen Reagent? Wrute ane Usefulness of Tollen Reagent
Why adsorbhon is exothermic, Explain.
Define electrophoresis.
Write Etard Reaction.

Topic:

Aldehydes & Ketones

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Question 7

12.19

An organic compound contains

69.77%

carbon,

11.63%

hydrogen and rest oxygen. The molecular mass of the compound is 86 . It does not reduce Tollens' reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Write the possible structure of the compound.

12.20

Although phenoxide ion has more number of resonating structures than carboxyląte ion. carboxylic acid is a stronger acid than phenol. Why? Answers to Some Intext Questions

Topic:

Aldehydes & Ketones

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Question 8

12.15 How will you bring about the following conversions in not more than two steps?

Propanone to Propene
Benzolc acid to Benzaldehyde

Topic:

Aldehydes & Ketones

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Question 9

Which of the following reagent (or) test CANNOT be used to distinguish 2-Methyl propanol and 2-methyl propan-2-ol

$I_{2} / NaOH$
$HCl /$ analy $ZnCl_{2}$
Victor-Meyer Test
Oxidation with $Cu$ at $573 K$

Topic:

Aldehydes & Ketones

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Question 10

Gives positive iodoform test (iii) Conc.

H_{2} SO_{4} /Δ

(i) \mathrm{CH}_{3} \mathrm{MgBr} } \\{\hline} \end{array} (ii)

H^{+}, H_{2} O

(B)

Topic:

Aldehydes & Ketones

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Question 11

Gives positive (ii)

H^{+}, H_{2} O

(iii) Conc.

H_{2} SO_{4} /Δ

iodoform test

Topic:

Aldehydes & Ketones

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Question 12

12.9. Write structural formulas and names of four possible aldol condensation products from propanal and butanal. In each case, indicate which aldehyde acts as nucleophile and which as electrophile.

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Aldehydes & Ketones

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Question 13

12.11. An organic compound (A) (molecular formula

C_{8} H_{16} O_{2}

) was hydrolysed with dilute sulphuric acid to give a carboxylic acid (B) and an alcohol (C). Oxidation of (C) with chromic acid produced (B). (Q on dehydration gives but-l-ene. Write equations for the reactions involved.

Topic:

Aldehydes & Ketones

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Question 14

12.11. An organic compound (A) (molecular formula

C_{8} H_{16} O_{2}

Topic:

Aldehydes & Ketones

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Question 15

Elimination of HBr from 2-bromobutane result in the formation of :

Predominantly 2-butyne
Predominantly 1 -butene
Predominantly 2-butene
Equimolar mixture of 1 and 2-butene

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Aldehydes & Ketones

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Question 16

Reaction of trans 2-phenyl-1-bromocyclopentane on reaction with alcoholic

KOH

produces:

2-phenylcyclopentene
1-phenylcyclopentene

Topic:

Aldehydes & Ketones

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Question 17

8. When a co-ordination compound

CrCl_{3} \cdot 6 H_{2} O

is mixed with

AgNO_{3}, 2

moles of

AgCl

are precipitated per mole of the compound. Write

(i) Structural formula of the complex. $[C_{r} C_{1}] \in_{1}$
(ii) IUPAC name of the complex.
9. For a reaction : $2 NH_{3} (g) ⟶ Pt N_{2} (g) + 3 H_{2} (g)$
Rate $= k$

Topic:

Aldehydes & Ketones

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Question 18

In the following reaction

[April 9,2019 (II)] Carbonyl compound

+ MeOH ⇌ ⇌ HCl

acetal Rate of the reaction is the highest for:

Acetone as substrate and methanol in excess.
Propanal as substrate and methanol in stoichiometric amount.
Propanal as substrate and methanol in excess.
Acetone as substrate and methanol in stoichiometric amount.

Topic:

Aldehydes & Ketones

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Question 19

11. The major product of the following reaction is: [Jan. 9, 2019 (I) ]

Topic:

Aldehydes & Ketones

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Question 20

Which of the following will be most acidic?

Topic:

Aldehydes & Ketones

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1 2 3 4 5 6...196

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Solution for Class 12, Chemistry, Aldehydes Ketones

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