MCQ
A strong base can abstract an $\alpha -$hydrogen from
  • ketone
  • B
    alkane
  • C
    alkene
  • D
    amine

Answer

Correct option: A.
ketone
a
since the carbonyl carbon is electron deficient, so most susceptible to attack by nucleophilic reagents or base. A base increases the acidity of hydrogen atom attached to the $\alpha-C$ of the ketones or aldehydes. That-why $\alpha$ -hydrogen is easily abstracted from ketones by a base, e.g. in aldol condensation reaction, $\alpha$ -hydrogen atom of aldehyde or ketone is abstracted by a strong base.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
In a thermostat two metal strips are used, which have different ............
A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to electron stream and above it. If the current in the conductor is from left to right then what will be the effect on electron stream
The figure showing the correct relationship between the stopping potential $V_0$ and the frequency $v$ of light for potassium and tungsten is
A  refrigerator works between $4^o C$ and $30^o C.$  It is required to remove $600$ calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is ....... $W$ (Take $1\, cal \,=\, 4.2\, Joules\,)$ 
Product $(D)$ will be
At time $t=0$, a car moving along a straight line has a velocity of $16 \;m / s$. It slows down with an acceleration of $-0.5 t \;m / s ^2$, where $t$ is in second. Mark the correct statement (s).
Acceleration of a particle, executing $SHM$, at it’s mean position is
In Guericke's experiment to show the effect of atmospheric pressure, two copper hemispheres were tightly fitted to each other to form a hollow sphere and the air from the sphere was pumped out to create vacuum inside. If the radius of each hemisphere is $R$ and the atmospheric pressure is $p$, then the minimum force required (when the two hemispheres are pulled apart by the same force) to separate the hemispheres is
A wave is propagating in a medium of electric dielectric constant $2$ and relative magnetic permeability $50$. The wave impedance of such a medium is.....$ \Omega$