Which of the following molecules has an axis | vedclass

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(D) An axis of symmetry $(AOS)$ is a line about which rotation by $360^{\circ}/n$ results in an identical orientation. $A$ plane of symmetry $(POS)$ i

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All of these

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(D) An axis of symmetry $(AOS)$ is a line about which rotation by $360^{\circ}/n$ results in an identical orientation. $A$ plane of symmetry $(POS)$ is a plane that divides a molecule into two mirror-image halves.$1$. Formaldehyde $(HCHO)$: It has a $C_2$ axis of symmetry passing through the $C=O$ bond and a plane of symmetry containing the atoms.$2$. $1,3$-Dichlorobenzene: It has a $C_2$ axis of symmetry and a plane of symmetry passing through the ring.$3$. Dichloromethane $(CH_2Cl_2)$: It has a $C_2$ axis of symmetry and a plane of symmetry.Since all the given molecules possess both an axis of symmetry and a plane of symmetry,the correct option is $D$.

Column-$I$	Column-$II$
$(P)$ $\underline PCl_5 \to PCl_3 + Cl_2$	$(i)$ Change in hybridisation
$(Q)$ $\underline SO_3 \to \underline SO_2 + \frac{1}{2}O_2$	$(ii)$ Change in bond angle
$(R)$ $\underline NH_3 + H^{+} \to \underline NH_4^+$	$(iii)$ Change in shape
$(S)$ $H_2\underline O + H^{+} \to H_3\underline O^{+}$	$(iv)$ Change in oxidation state

Column $I$ (Molecules)	Column $II$ (Number of lone pairs on central atom)
$A. \ NH_3$	$1. \ \text{Two}$
$B. \ H_2O$	$2. \ \text{Three}$
$C. \ XeF_2$	$3. \ \text{Zero}$
$D. \ CH_4$	$4. \ \text{Four}$
	$5. \ \text{One}$

Which of the following molecules has an axis of symmetry and a coaxial plane of symmetry?

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Assertion: $H_2O$ and $XeF_4$ both have a plane of symmetry.
Reason: $H_2O$ is a polar molecule,whereas $XeF_4$ is a non-polar molecule.

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