Alcohols Test

Result

Alcohols Test - 8

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Weekly Quiz Competition

Question 1
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Consider the following reaction sequence,

R —OH R —I R —NO₂ Blue

Hence, R —OH could be

A
C₆ H₅ — CH₂ OH

B
CH₃ CH₂ OH

C

D
All are correct

Solution

Both primary and secondary alcohols form blue solution in Victor Meyer test due to the formation of respectively nitrolic acid and pseudonitrol. Tertiary alcohols form neither, hence no blue colouration is observed.
Question 2
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Consider the following reaction,

The correct statement(s) concerning X and Y is/are

A
Both form immediate turbidity with HCI in the presence of ZnCI₂

B
Both change colour of CrO₃ -H₂ SO₄

C
X decolourises Br₂ -CCI₄ solution forming C₆ H₁₂ OBr₂

D
Option A,C are Correct

Solution

X neither oxidised by chromic acid nor gives iodoform.
Question 3
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Comprehension Type

Direction : This section contains a passage describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d).

Passage

An organic compound X (C₉ H₁₂ O) gives the following reactions :
i. Na - Slow gas bubble formation
ii. Acetic anhydride - Pleasent smelling liquid
iii. CrO₃ -H₂ SO₄ - Blue-green solution
iv. Hot KMnO₄ - Benzoic acid
v. Br₂ -CCI₄ - No decolouration
vi. I₂ + NaOH - Yellow solid is formed
vii. X rotates the plane polarised light

Q.

The structure of X is

A

B

C

D

Solution

Also X, has CH₃ —CH(OH)—, gives iodoform test and it is chiral.
Question 4
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An organic compound X (C₉ H₁₂ O) gives the following reactions :
i. Na - Slow gas bubble formation
ii. Acetic anhydride - Pleasent smelling liquid
iii. CrO₃ -H₂ SO₄ - Blue-green solution
iv. Hot KMnO₄ - Benzoic acid
v. Br₂ -CCI₄ - No decolouration
vi. I₂ + NaOH - Yellow solid is formed
vii. X rotates the plane polarised light

Q.

If X is treated with HCI in the presence of ZnCI₂ , the major product would be

A

B

C

D

Solution

Also X, has CH₃ —CH(OH)—, gives iodoform test and it is chiral.
Question 5
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An organic compound X (C₉ H₁₂ O) gives the following reactions :
i. Na - Slow gas bubble formation
ii. Acetic anhydride - Pleasent smelling liquid
iii. CrO₃ -H₂ SO₄ - Blue-green solution
iv. Hot KMnO₄ - Benzoic acid
v. Br₂ -CCI₄ - No decolouration
vi. I₂ + NaOH - Yellow solid is formed
vii. X rotates the plane polarised light

Q.

An isomer of X, Y was also found to be optically active. It showed the same reactions as X except (vi). Hence, Y is

A

B

C

D

Solution

Also X, has CH₃ —CH(OH)—, gives iodoform test and it is chiral.

does not give iodoform test but gives all other reaction similar to X.
Question 6
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One Integer Value Correct Type

Direction : This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

An organic compound X (C₅ H₁₂ O) is chiral. Also

Q.

How many primary hydrogens are present in X?

A
8

B
9

C
0

D
1

Solution

X is a primary alcohol as indic ated by Victor Meyer test as well as it has a chiral carbon, hence
Question 7
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An alcohol X (C₇ H₁₆ O) gives immediate turbidity with HCI/ZnCI₂ and can be resolved into enantiomers. Also X has a tertiary hydrogen. How many CH₃ —groups are present in X?

A
1

B
4

C
0

D
8

Solution

Compound X satisfying the given criteria is
Question 8
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An alcohol X (C₄ H₁₀ O₃ ) is chiral and absorbs two moles of HIO₄ per mole of X. How many stereoisomers exist for X?

A
0

B
1

C
4

D
9

Solution

X satisfying the given criteria is

Hence, X has four optically active isomers.
Question 9
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An organic compound X (C₇ H₁₆ O) gives effervescence with Na. X has both enantiomers and diastereomers. X gives yellow precipitate with alkaline iodine solution. With CrO₃ - H₂ SO₄ , X is converted into C₇ H₁₄ O (Y) which has enantiom ers but not diastereom ers. X on refluxing with H₂ SO₄ isomerises to Z which neither gives yellow precipitate with alkaline iodine nor changes colour of CrO₃ - H₂ SO₄ . What is the minim um number of carbons that can be present in the parent chain of X ?

A
9

B
4

C
3

D
5

Solution

From the give condition, structure of X is derived to be