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Which of the following is correct ? [2001]
  • a)
    On reduction of any aldehyde, secondary alcohol is formed
  • b)
    Reaction of vegetable oil with H2SO4 gives glycerine
  • c)
    Sucrose on reaction with NaCl gives invert sugar
  • d)
    Alcoholic iodine gives iodoform with NaOH
Correct answer is option 'D'. Can you explain this answer?
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Which of the following is correct ? [2001]a)On reduction of any aldehy...
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Which of the following is correct ? [2001]a)On reduction of any aldehy...
The other three are wrong as
Option a) On reduction of any aldehyde,primary alcohol is formed.
Option b) Reaction of vegetable oils with H2SO4 gives unsaturated alcohol.
Option c ) Sucrose on reaction with NaCl gives no product.[No reaction].
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Which of the following is correct ? [2001]a)On reduction of any aldehy...
The correct answer is option 'D': Alcoholic iodine gives iodoform with NaOH.

Explanation:
Iodoform is a yellow crystalline solid that has a distinct odor and is commonly used as an antiseptic. It is also a useful reagent in organic chemistry for the identification of methyl ketones.

When an alcohol reacts with an oxidizing agent such as iodine in the presence of a base like sodium hydroxide (NaOH), it undergoes oxidation to form an aldehyde or ketone. In the case of iodoform formation, the alcohol being used is tertiary alcohol.

Here is the stepwise reaction for the formation of iodoform from a tertiary alcohol using alcoholic iodine and NaOH:

1. The reaction starts with the deprotonation of the alcohol by the base (NaOH) to form the alkoxide ion.
2. The alkoxide ion then reacts with iodine (I2) to form the iodoalkoxide intermediate.
3. The iodoalkoxide undergoes nucleophilic substitution with iodine ions (I-) present in the reaction mixture to form the triiodomethoxide ion.
4. The triiodomethoxide ion then loses a hydroxide ion (OH-) to form iodoform (CHI3) and the base (NaOH) is regenerated.

The overall reaction can be represented as follows:
R3COH + 4I2 + 6NaOH → R3CCI3 + 5NaI + 5H2O

In this reaction, R represents an alkyl group in the tertiary alcohol.

It is important to note that this reaction is specific to tertiary alcohols. Primary and secondary alcohols do not undergo this reaction to form iodoform. Instead, they undergo oxidation to form aldehydes and ketones, respectively.

In conclusion, option 'D' is the correct answer because alcoholic iodine (I2) reacts with NaOH to give iodoform (CHI3) when a tertiary alcohol is used as the starting material.
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Read the passage given below and answer the following questions:Reductive alkylation is the term applied to the process of introducing alkyl groups into ammonia or a primary or secondary amine by means of an aldehyde or ketone in the presence of a reducing agent. The present discussion is limited to those reductive alkylations in which the reducing agent is hydrogen and a catalyst or "nascent" hydrogen, usually from a metalacid combination; most of these reductive alkylations have been carried out with hydrogen and a catalyst. The principal variation excluded is that in which the reducing agent is formic acid or one of its derivatives; this modification is known as the Leuckart reaction. The process of reductive alkylation of ammonia consists in the addition of ammonia to a carbonyl compound and reduction of the addition compound or its dehydration product. The reaction usually is carried out in ethanol solution when the reduction is to be effected catalytically:Since the primary amine is formed in the presence of the aldehyde it may react in the same way as ammonia, yielding an additional compound, a Schiff's base (RCH= NCH2R) and finally, a secondary amine. Similarly, the primary amine may react with the imine, forming an addition product which also is reduced to a secondary amine Finally, the secondary amine may react with either the aldehyde or the imine to give products which are reduced to tertiary amines.Similar reactions may occur when the carbonyl compound employed is a ketone.Q. The reaction of ammonia and its derivatives with aldehydes is called

Which of the following is correct ? [2001]a)On reduction of any aldehyde, secondary alcohol is formedb)Reaction of vegetable oil with H2SO4 gives glycerinec)Sucrose on reaction with NaCl gives invert sugard)Alcoholic iodine gives iodoform with NaOHCorrect answer is option 'D'. Can you explain this answer?
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Which of the following is correct ? [2001]a)On reduction of any aldehyde, secondary alcohol is formedb)Reaction of vegetable oil with H2SO4 gives glycerinec)Sucrose on reaction with NaCl gives invert sugard)Alcoholic iodine gives iodoform with NaOHCorrect answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Which of the following is correct ? [2001]a)On reduction of any aldehyde, secondary alcohol is formedb)Reaction of vegetable oil with H2SO4 gives glycerinec)Sucrose on reaction with NaCl gives invert sugard)Alcoholic iodine gives iodoform with NaOHCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct ? [2001]a)On reduction of any aldehyde, secondary alcohol is formedb)Reaction of vegetable oil with H2SO4 gives glycerinec)Sucrose on reaction with NaCl gives invert sugard)Alcoholic iodine gives iodoform with NaOHCorrect answer is option 'D'. Can you explain this answer?.
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