back to directory
NEET CHEMISTRYAlcohols, Phenols and EthersEasy

Question

The correct statement among the following is:

A

Any aldehyde gives secondary alcohol on reduction.

B

The reaction of vegetable oil with H₂SO₄ gives glycerin.

C

C₂H₅OH and iodine with NaOH give iodoform.

D

Sucrose in reaction with NaCl gives invert sugar.

Step-by-Step Solution

  1. Option 1 (Incorrect): Reduction of aldehydes (RCHORCHO) generally yields primary alcohols (RCH2OHRCH_2OH), not secondary alcohols. Secondary alcohols are obtained from the reduction of ketones (RCOR′RCOR'). (General organic chemistry principles).
  2. Option 2 (Incorrect): Vegetable oils are esters of glycerol (triglycerides). Their hydrolysis (saponification) to give glycerol (glycerin) is typically carried out with bases like NaOH, not concentrated H2SO4H_2SO_4 which is a dehydrating agent.
  3. Option 3 (Correct): Ethanol (C2H5OHC_2H_5OH) contains the methyl carbinol group (CH3−CH(OH)−CH_3-CH(OH)-). When treated with iodine (I2I_2) and alkali (NaOHNaOH), it undergoes the Iodoform reaction to produce a yellow precipitate of Iodoform (CHI3CHI_3). The reaction is: C2H5OH+4I2+6NaOH→CHI3+HCOONa+5NaI+5H2OC_2H_5OH + 4I_2 + 6NaOH \rightarrow CHI_3 + HCOONa + 5NaI + 5H_2O. (This reaction is implicitly supported by the text discussing Iodoform tests for methyl ketones and alcohols ).
  4. Option 4 (Incorrect): Inversion of sucrose (hydrolysis) into glucose and fructose occurs in the presence of acid (H+H^+) or the enzyme invertase, not NaCl .

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Alcohols, Phenols and Ethers. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYAlcohols, Phenols and Etherscorrectstatementfollowing

More Alcohols, Phenols and Ethers Questions

View all

When phenol is treated with CHCl₃ and NaOH, the product formed is:

A.Benzaldehyde
B.Salicylaldehyde
C.Salicylic acid
D.Benzoic acid
EasySolve

Which of the following statement is correct for the stability of ions of ethyl alcohol and phenol:

A.Delocalization of π-electrons in phenoxide ion
B.Delocalization of electrons in ethoxide ion
C.Inductive effect of ethyl and phenyl group
D.Localization of σ-electrons in phenoxide ion
MediumSolve

When glycerol is treated with an excess of HI, it produces:

A.Allyl iodide
B.Propene
C.Glycerol triiodide
D.2-Iodopropane
HardSolve

Which of the following can be used as the halide component for Friedel-Crafts reaction?

A.Chlorobenzene
B.Bromobenzene
C.Chloroethene
D.Isopropyl chloride
MediumSolve

Which of the following is not the product of dehydration of the given alcohol?

A.Option 1
B.Option 2
C.Option 3
D.Option 4
MediumSolve

The most reactive compound among the following toward electrophilic aromatic substitution reaction is:

A.Toluene
B.Benzene
C.Chlorobenzene
D.Nitrobenzene
MediumSolve

Which one of the following compounds will be most readily dehydrated?

A.Option 1
B.Option 2
C.4
D.Option 4
MediumSolve

Among the following four compounds: (a) Phenol (b) Methyl phenol (c) meta-nitrophenol (d) para-nitrophenol The acidity order is:

A.c > d > a > b
B.a > d > c > b
C.b > a > c > d
D.d > c > a > b
MediumSolve

Why 32,000+ students choose TopperSquare

Everything you need to crack NEET

15,000+ Chapter MCQs

Physics, Chemistry, Biology — chapter-wise, topic-wise practice

AI Performance Analytics

Know your weak topics. Get a personalised study plan.

Full NEET Mock Tests

180 questions, timed, with detailed score analysis

PYQ Sets 2010–2024

15 years of past papers with solved explanations

Start Practising Free

No credit card · 30-second signup · Free forever plan included

This neet chemistry practice question is part of the TopperSquare free question bank. TopperSquare offers 15,000+ chapter-wise NEET MCQs across Physics, Chemistry, and Biology with detailed step-by-step explanations, full mock tests, NEET PYQs (2010–2024), and an AI-powered performance analytics dashboard. browse all neet practice questions → · practice chemistry sets →

Explore more subjects:Physics MCQs•Chemistry MCQs•Biology MCQs•Botany MCQs•Zoology MCQs•NEET Mock Tests•NEET PYQs