MCQ
Which amino acid is achiral?
  • A
    Alanine
  • B
    Valine
  • C
    Proline
  • Glycine

Answer

Correct option: D.
Glycine
A chiral center of a molecule is the atom that is bonded to four different chemical species.
Glycine is the simplest amino acid. Its side$-$chain $($called the $R-$group$)$ has two hydrogen atoms.
Because it has two hydrogen atoms as its sidechain, glycine is the only achiral amino acid.

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

During depression of freezing point in a solution the following are in equilibrium
Henry's law constants for $O_2$ and $N_2$ are ${K_O}_{_2} = 3.3 \times {10^7}{\mkern 1mu} atm,{\mkern 1mu} {\mkern 1mu} {K_{{N_2}}} = 6.51 \times {10^7}{\mkern 1mu} atm$ Calculate the ratio of $\frac{{{X_{{O_2}}}}}{{{X_{{N_2}}}}}$ i.e. the ratio of mole fractions of $O_2$ and $N_2$ dissolved in water at $25\,^oC$ from air
Principal organic product of the reaction will be
In the following reaction sequence the major products $B$ is
$Zn $ gives hydrogen gas with ${H_2}S{O_4}$ and $HCl$ but not with $HN{O_3}$ because
A gaseous mixture contains equal masses of dihydrogen gas, dioxygen gas and methane gas at a total pressure of $380\ torr$. The partial pressure of methane gas is ........... $torr$.
A compound $A$ has molecular formula $\ce{C_7​H_7​NO}.$ On treatment with $Br_2$ and $\text{KOH},$ A gives an amine $B$ which gives carbylamine test$. B$ upon diazotization and coupling with phenol gives an azo dye$. A$ can be:
The odd decomposition of carbon chlorine bond form
A liquid was mixed with ethanol and a drop of concentrated $H_2SO_4$ was added. A compound with a fruity smell was formed. The liquid was :
Match List $I$ with $II$ and pick the correct matching from the codes given below
  List $I$ (Haloalkane/arene)   Lits $II$ (Application)
$A.$ Iodoform $1.$ $CF_4$
$B.$ $BHC$ $2.$ Antiseptic
$C.$ Freon $-14$ $3.$ Moth repellent
$D.$ Halothanes $4.$ Inhalative anaesthetic
$E.$ $p-$ Dichlorobenzene $5.$ Termite pesticide