In the Wurtz-Fitting reaction, a compound reacts with an alkyl halide. What is ?
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2
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4
Official Solution
Correct Option: (2)
- The Wurtz-Fitting reaction involves coupling an alkyl halide with an aromatic halide in the presence of sodium. - The correct compound must be a halogenated benzene that can react in this process. - Among the options, Option (2) has a halogen-substituted benzene ring, making it the correct choice.
02
PYQ 2024
medium
chemistryID: ap-eamce
The product (C) in the given reaction sequence is:
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3
4
Official Solution
Correct Option: (4)
- The reaction sequence involves bromination followed by nucleophilic substitution with aqueous . - The final product is hydroxylated benzene where bromine is replaced with -OH. Thus, the correct answer is Option (4).
03
PYQ 2024
easy
chemistryID: ap-eamce
The diffraction pattern of a crystalline solid gave a peak at . What is the distance (in cm) between the layers that gave this peak?
1
cm
2
cm
3
cm
4
cm
Official Solution
Correct Option: (3)
Step 1: Using Bragg’s Law. Bragg’s equation:
For first-order diffraction ( ):
Step 2: Substituting Values.
Thus, the correct answer is (3).
04
PYQ 2024
hard
chemistryID: ap-eamce
A dibromide on dehydrohalogenation gave , which on reduction with gave a non-polar isomer of . What are and respectively?
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2
3
4
Official Solution
Correct Option: (1)
Step 1: Identifying and . - is a vicinal dibromide (contains two Br atoms on adjacent carbons). - Dehydrohalogenation ( ) leads to the formation of an alkyne (Y).
Step 2: Identifying . - Reduction of using Na/NH (liq) results in a non-polar alkene (trans-isomer). - Pd/C reduction would give a cis-alkene, which is polar. Since the question specifies a non-polar product, the reduction must have been performed using Na/NH (liq), leading to a trans-alkene. Thus, the correct answer is (1).
05
PYQ 2024
medium
chemistryID: ap-eamce
The sequence of reagents required to convert ethyl bromide to propanal is:
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4
Official Solution
Correct Option: (1)
Step 1: Understanding the conversion steps 1. Ethyl bromide reacts with silver acetate (CH₃COOAg) to form ethyl acetate. 2. DIBAL-H (Diisobutylaluminium hydride) selectively reduces ethyl acetate to propanal. 3. Hydrolysis ensures complete conversion to aldehyde without further reduction to alcohol.
06
PYQ 2024
medium
chemistryID: ap-eamce
Some substances are given below Ag: CO (s); SiO (s); ZnS (s) SO (s); A/N: HCl (s); H O (s) The number of molecular solids and network solids in the above list is respectively.
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3, 3
2
2, 4
3
1, 4
4
4, 2
Official Solution
Correct Option: (4)
- Molecular solids are those which consist of discrete molecules held together by van der Waals forces. - Network solids are those where atoms are covalently bonded in a continuous network. From the list: - Ag (Silver) is a metallic solid, so it is not counted. - CO , SiO , and ZnS are network solids. - SO , HCl, and H O are molecular solids. Thus, the number of molecular solids is 2, and the number of network solids is 4.
07
PYQ 2024
medium
chemistryID: ap-eamce
What are X, Y, Z in the following reaction sequence respectively?
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2
3
4
Official Solution
Correct Option: (2)
Step 1: Understanding the reaction sequence 1. Gattermann-Koch reaction: The first step involves CO, HCl, and CuCl, leading to the formation of benzaldehyde. 2. Cannizzaro reaction: Strong base (NaOH) induces disproportionation, producing hydroxybenzyl benzoate and sodium benzoate.
