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How many different alkyne isomers upon hydrogenation in the presence of CaCO3 / Pd gives 4-methyl hexene which is simultaneously c/s at double bond?
    Correct answer is '2'. Can you explain this answer?
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    How many different alkyne isomers upon hydrogenation in the presence o...
    Solution:

    Given: Hydrogenation of alkyne in the presence of CaCO3 / Pd gives 4-methyl hexene which is simultaneously cis/trans at double bond.

    To find: Number of different alkyne isomers.

    Step 1: Write the formula of 4-methyl hexene.

    4-methyl hexene formula: CH3-CH2-CH=CH-CH2-CH3

    Step 2: Draw the structural formula of 4-methyl hexene.

    H H
    │ │
    H-C-C-C=C-C-H
    │ │
    H CH3

    Step 3: Identify the position of the double bond.

    Double bond is present between 3rd and 4th carbon atoms.

    Step 4: Identify the alkynes which can give 4-methyl hexene upon hydrogenation in the presence of CaCO3 / Pd.

    There are 2 possible alkyne isomers which can give 4-methyl hexene upon hydrogenation in the presence of CaCO3 / Pd.

    - 3-methyl-1-pentene - This alkyne can give 4-methyl hexene upon hydrogenation in the presence of CaCO3 / Pd. The double bond is present between 2nd and 3rd carbon atoms. On hydrogenation, the double bond is converted into a single bond and a methyl group is added to the 3rd carbon atom.
    - 2-methyl-2-pentene - This alkyne can also give 4-methyl hexene upon hydrogenation in the presence of CaCO3 / Pd. The double bond is present between 2nd and 3rd carbon atoms. On hydrogenation, the double bond is converted into a single bond and a methyl group is added to the 4th carbon atom.

    Both of these alkyne isomers give 4-methyl hexene which is simultaneously cis/trans at double bond.

    Therefore, the correct answer is '2'.
    Free Test
    Community Answer
    How many different alkyne isomers upon hydrogenation in the presence o...
    Yes cis when both side left and right side double bond same thing same side
    So ch3-c ///c-cch2ch3
    where this /// denotes triple bond
    here h h on same side on hydrogenation
    ch3ch2ch2cch3///chch3
    where /// is triple bond here ch 3 ch 3 on same side
    it is not EZ configuration but cis trans Bhai
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