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NEET Chemistry: Structure Practice Questions

13 free multiple-choice questions on Structure (Ethers) for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.

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  1. Q1. Which of the following represents the general structure of an ether?

    • AR-C-O-C
    • BR-O-R'
    • CR-C(=O)-O-R
    • DR-OH
    Show answer & explanation

    Correct answer: B — R-O-R'

    An ether is characterized by the presence of an oxygen atom bonded to two alkyl or aryl groups (R-O-R').

  2. Q2. Which of the following correctly represents the structural formula of an ethyl ether?

    • ACH3CH3OCH3
    • BCH3CH2OCH2CH3
    • CCH3CH2OCH3
    • DCH3OCH2CH3
    Show answer & explanation

    Correct answer: D — CH3OCH2CH3

    An ethyl ether has two ethyl groups attached to the oxygen atom. The structure is derived from ethane (CH3CH3) and oxygen, leading to the structure CH3-O-CH2CH3.

  3. Q3. In the ether molecule R-O-R', the bond angle around the oxygen atom is typically:

    • A180°
    • B109.5°
    • C120°
    • D60°
    Show answer & explanation

    Correct answer: A — 180°

    Oxygen is a second-row element, and the lone pair repulsion dictates the bond angle, which is generally around 105° to 110° (closer to 109.5° than 120° or 180° due to lone pair repulsion).

  4. Q4. Consider the simple structure of an ether. If the two alkyl groups attached to the oxygen are different, the ether is classified as:

    • ACyclic ether
    • BAromatic ether
    • CUnsymmetrical ether
    • DSymmetrical ether
    Show answer & explanation

    Correct answer: C — Unsymmetrical ether

    If R ≠ R', the ether is unsymmetrical. If R = R', it is symmetrical.

  5. Q5. Which of the following compounds represents the simplest ether structure, C₂H₆O?

    • ACH₄O
    • BCH₃CH₂OH
    • CCH₃OCH₃
    • DCH₃CH₂O
    Show answer & explanation

    Correct answer: C — CH₃OCH₃

    The simplest ether is dimethyl ether, CH₃OCH₃. The formula C₂H₆O corresponds to this structure, where two methyl groups are attached to the oxygen atom.

  6. Q6. Which structural isomer of an ether exhibits symmetry around the oxygen atom?

    • ADiethyl ether
    • BEthyl methyl ether
    • CMethyl propyl ether
    • DPropyl ethyl ether
    Show answer & explanation

    Correct answer: A — Diethyl ether

    Diethyl ether (CH₃CH₂OCH₂CH₃) has a symmetrical structure due to the identical alkyl groups attached to the oxygen atom, making it symmetrically substituted.

  7. Q7. Which of the following ethers is expected to have a higher boiling point due to stronger intermolecular forces?

    • ACH₃OCH₃
    • BCH₃OCH₂CH₂CH₃
    • CCH₃OCH₃ and CH₃CH₂OH
    • DCH₃OCH₂CH₃
    Show answer & explanation

    Correct answer: B — CH₃OCH₂CH₂CH₃

    Boiling points increase with molecular size and increased surface area for van der Waals forces. CH₃OCH₂CH₂CH₃ (n-propyl ethyl ether) is larger than the simplest isomer, and its increased chain length leads to stronger London dispersion forces compared to the simplest ether.

  8. Q8. Which functional group is characteristic of an ether?

    • ACarboxylic acid group (-COOH)
    • BHydroxyl group (-OH)
    • CCarbonyl group (C=O)
    • DEther linkage (-O-)
    Show answer & explanation

    Correct answer: D — Ether linkage (-O-)

    The defining feature of an ether is the presence of an oxygen atom incorporated into the carbon chain, forming the R-O-R' linkage.

  9. Q9. The bond formed by the oxygen atom in an ether linkage is primarily classified as:

    • AC-O single bond
    • BC=O double bond
    • CC-O bond
    • DO-H bond
    Show answer & explanation

    Correct answer: A — C-O single bond

    In ethers, the oxygen atom is connected to carbon atoms via single bonds (C-O), making it a C-O single bond, unlike in alcohols where it is an O-H bond.

  10. Q10. What is the primary structural element that differentiates an ether from an alcohol?

    • APresence of a triple bond
    • BPresence of a hydroxyl group (-OH)
    • CPresence of a C=O bond
    • DPresence of an oxygen atom bridging two carbon atoms
    Show answer & explanation

    Correct answer: D — Presence of an oxygen atom bridging two carbon atoms

    Alcohols contain the hydroxyl group (-OH), whereas ethers contain the oxygen atom bridging two carbon atoms (R-O-R').

  11. Q11. What is the primary structural difference between an ether and an alcohol?

    • AEthers contain a carbonyl group while alcohols do not
    • BEthers contain an R-O-R' linkage while alcohols contain an R-OH linkage
    • CAlcohols are always polar while ethers are always non-polar
    • DEthers lack the oxygen atom while alcohols possess it
    Show answer & explanation

    Correct answer: B — Ethers contain an R-O-R' linkage while alcohols contain an R-OH linkage

    The fundamental structural difference is the presence of the oxygen atom linkage in ethers (R-O-R') versus the hydroxyl group linkage (R-OH) found in alcohols.

  12. Q12. What is the functional group present in an ether?

    • AHydroxyl group (-OH)
    • BCarbonyl group (C=O)
    • CEther linkage (-O-)
    • DCarboxyl group (-COOH)
    Show answer & explanation

    Correct answer: C — Ether linkage (-O-)

    The defining functional group for an ether is the R-O-R' linkage.

  13. Q13. The structure of an ether is defined by the presence of which type of bond?

    • AC-O-C bond
    • BC-C bond
    • CO-O bond
    • DC=O bond
    Show answer & explanation

    Correct answer: A — C-O-C bond

    The ether linkage is fundamentally an oxygen atom bonded between two carbon atoms (C-O-C).

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