Question

$Z-\stackrel{Z}{\stackrel{|}{\underset{Z}{\underset{|}{X}}}}-\stackrel{Z}{\stackrel{|}{\underset{Z}{\underset{|}{X}}}}-\stackrel{Z}{\stackrel{|}{X}}=Y$

Given here is the structural formula of the compound formed of X, Y and Z elements.

X is a tetravalent element and exhibits catenation property. Y belongs to group 16 and period 2. Z is the only non-metal present in the reactivity series.

The next member of homologous series of the above compound is?

• A. $C{H}_{3}CHO$
• B. $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}CHO$
• C. $C{H}_{3}C{H}_{2}C{H}_{2}CHO$
• D. none of these

Answer 1

Answer: (C)

$C{H}_{3}C{H}_{2}C{H}_{2}CHO$

X is carbon, a tetravalent element that exhibits catenation property.

Y is oxygen, element that to group 16 and period 2.

Z is hydrogen, the only non-metal present in the reactivity series.

This compound has 3 carbon atoms and can be written as:

$H-\stackrel{H}{\stackrel{|}{\underset{H}{\underset{|}{C}}}}-\stackrel{H}{\stackrel{|}{\underset{H}{\underset{|}{C}}}}-\stackrel{H}{\stackrel{|}{C}}=O$

So, the next member of homologous series of the above compound will have 4 carbon atoms.