Alkyl halides give alcohol with aqueous KOH whereas in the presence of alcoholic KOH, alkenes are formed. Give reasons.
Solution and Explanation
- Aqueous KOH favors nucleophilic substitution (SN1/SN2) reactions, where OH− acts as a nucleophile, forming alcohols.
- Alcoholic KOH, due to the presence of alkoxide ions (RO−), is a stronger base and favors the elimination (E2) reaction, leading to alkene formation.
Top Questions on Aldehydes And Ketones
Explain with the help of chemical reactions: (I) Acetone is treated with semicarbazide.
- CBSE Compartment XII - 2025
- Chemistry
- Aldehydes And Ketones
- Account for the following: (i) CH\(_3\)CHO is more reactive than CH\(_3\)COCH\(_3\) towards reaction with HCN.
- CBSE Compartment XII - 2025
- Chemistry
- Aldehydes And Ketones
- Which of the following does not undergo aldol condensation?
- CBSE Compartment XII - 2025
- Chemistry
- Aldehydes And Ketones
Would you expect benzaldehyde to be more reactive or less reactive in nucleophilic addition reactions than propanal? Justify your answer.
- CBSE CLASS XII - 2025
- Chemistry
- Aldehydes And Ketones
- Write the stepwise mechanism of nucleophilic addition reactions in the carbonyl compounds.
- CBSE CLASS XII - 2024
- Chemistry
- Aldehydes And Ketones
Questions Asked in CBSE CLASS XII exam
- If \( P(A) = \frac{1}{5}, P(B) = \frac{3}{5} \) and \( P(A \cap B) = \frac{2}{5} \), then \( P(A' \cup B') \) is :
- CBSE CLASS XII - 2025
- Probability
- Chandan, Deepak and Elvish were partners in a firm sharing profits and losses in the ratio of 1 : 2 : 2. Their Balance Sheet as at 31st March, 2024 stood as follows:
Balance Sheet of Chandan, Deepak and Elvish as at 31st March, 2024
Chandan retired from the firm on 1st April, 2024 on the following terms:Liabilities Amount (₹) Assets Amount (₹) Capitals: Fixed Assets 27,00,000 Chandan 7,00,000 Stock 3,00,000 Deepak 5,00,000 Debtors 2,00,000 Elvish 3,00,000 Cash 1,00,000 General Reserve 4,50,000 Creditors 13,50,000 Total 33,00,000 Total 33,00,000
[(i)] Fixed assets were to be depreciated by 10%.
[(ii)] Debtors of ₹ 30,000 were to be written off as bad debts.
[(iii)] Goodwill of the firm was valued at ₹ 6,00,000 and the retiring partner’s share is adjusted through the capital accounts of the remaining partners.
[(iv)] Chandan was paid through cash brought in by Deepak and Elvish in such a way so as to make their capitals proportionate to their new profit sharing ratio. Prepare Revaluation Account and Partners’ Capital Accounts. A coil of 60 turns and area \( 1.5 \times 10^{-3} \, \text{m}^2 \) carrying a current of 2 A lies in a vertical plane. It experiences a torque of 0.12 Nm when placed in a uniform horizontal magnetic field. The torque acting on the coil changes to 0.05 Nm after the coil is rotated about its diameter by 90°. Find the magnitude of the magnetic field.
- CBSE CLASS XII - 2025
- Magnetism and matter
- ‘A thing of beauty is a joy forever.’ Explain with reference to the poem. (A Thing of Beauty)
- CBSE CLASS XII - 2025
- Literature
- A voltmeter of resistance 1000 \( \Omega \) can measure up to 25 V. How will you convert it so that it can read up to 250 V?
- CBSE CLASS XII - 2025
- Units and measurement