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is it 1 ?
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No ........
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Is answer to this question =5 ?
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How 5 explain??
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I can explain how I got 5 but is it right? Otherwise I should try something else.

$\\ Draw\ a\ K_{4,5}. \\ Now\ when\ you\ will\ complement\ it\ you\ will\ get\ K_{4}\ and\ K_{5}\\ Means \ a\ disconnected\ graph\ with\ two\ components\\ For\ K_{5} \ you\ need\ 5 \ colors\ and\ out \ of\ those\ pick\ any \ 4 \ colors \ and \ color\ K_{4}.\\ So\ chromatic\ number=5$
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I didn't get it
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You first tell. Is 5 right or wrong answer?
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Yes right
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See the figures. When you complement the K4,5 you will get K4 and K5 and color them.

+1 vote  This is what i am talking about. by (176 points)
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Comment of @Masterk

$\\ Draw\ a\ K_{4,5}. \\ Now\ when\ you\ will\ complement\ it\ you\ will\ get\ K_{4}\ and\ K_{5}\\ Means \ a\ disconnected\ graph\ with\ two\ components\\ For\ K_{5} \ you\ need\ 5 \ colors\ and\ out \ of\ those\ pick\ any \ 4 \ colors \ and \ color\ K_{4}.\\ So\ chromatic\ number=5$ $K_{4,5}$

Now when we will complement it we will get $K_4$ and $K_5$ As you can see we can colour the Graph now using only $5$ colours.

Hope you now understood.

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Thanks brother.