जो रंग तुम्हें पसंद आया, वह चुनो।

This is a very common Hindi relative-correlative pattern.

• जो = which / that / the one that
• वह = that / that one

So:

• जो रंग तुम्हें पसंद आया = the color that you liked
• वह चुनो = choose that

Together, जो ... वह ... works like whichever ... that ... or the one that ... choose that.

It is one of the most useful Hindi sentence patterns to learn:

• जो अच्छा लगे, वह लो। = Take the one that seems good.
• जो चाहिए, वह बताओ। = Tell me what you want.

Because पसंद आना does not work like English to like.

In Hindi, the structure is more like:

• X is pleasing to someone
• so the person is marked with को / मुझे / तुम्हें / उसे, not as the subject

So:

• मुझे यह रंग पसंद है। = I like this color.
• Literally: This color is pleasing to me.

In your sentence:

• तुम्हें = to you
• रंग is the thing being liked

That is why तुम्हें is used, not plain तुम.

पसंद आया comes from the expression पसंद आना, which means to be liked / to appeal / to seem pleasing.

So:

• तुम्हें पसंद आया = you liked it / it appealed to you

Literally, it is closer to:

• it came as pleasing to you

This is different from English, where you are the subject:

• English: You liked the color
• Hindi structure: The color pleased you

That is why the grammar may feel reversed at first.

Because आया agrees with रंग, which is:

• masculine
• singular

In पसंद आना, the verb usually agrees with the thing that is liked, not with the person who likes it.

So:

• रंग → masculine singular → आया
• किताब → feminine singular → आई
• रंगों / plural masculine → आए

Examples:

• जो किताब तुम्हें पसंद आई, वह लो।
• जो जूते तुम्हें पसंद आए, वे खरीद लो।

चुनो is the imperative form used with तुम.

Hindi has different imperative levels depending on formality:

• तू → चुन
• तुम → चुनो
• आप → चुनिए / चुनिये or चुनें

So this sentence is speaking to tum, which is:

• familiar
• normal
• not very formal, but not rude in many contexts

If you wanted a more polite version, you could say:

• जो रंग आपको पसंद आया, वह चुनिए।

Both refer to the same word.

• वह is the standard written form
• वो reflects common pronunciation in everyday speech

So in speech, many people would naturally say:

• जो रंग तुम्हें पसंद आया, वो चुनो।

But in careful writing, textbooks, and formal Hindi, वह is very common.

The same thing happens with:

• यह → often pronounced ये
• वह → often pronounced वो

Yes, but the nuance changes a little.

• जो रंग तुम्हें पसंद आया, वह चुनो। = the color that you liked / the one that appealed to you

• जो रंग तुम्हें पसंद है, वह चुनो। = choose the color that you like

पसंद है sounds more like a current preference. पसंद आया can sound like a reaction after seeing options, as in the color you liked when you saw it.

In many real-life situations, both could work.

Yes, रंग here is singular: color.

If you want plural, the sentence changes:

• जो रंग तुम्हें पसंद आए, वे चुनो।

Changes:

• रंग can still look the same in direct plural
• आया becomes आए to agree with plural masculine
• वह becomes वे for plural

So:

• singular: जो रंग तुम्हें पसंद आया, वह चुनो।
• plural: जो रंग तुम्हें पसंद आए, वे चुनो।

The given order is natural and standard.

• जो रंग तुम्हें पसंद आया, वह चुनो।

Hindi often puts the relative clause first and then the main clause:

• जो ... , वह ...

You may hear small variations in conversation, but this pattern is the clearest and most textbook-like.

A shorter conversational version is also possible:

• जो रंग पसंद आया, चुन लो। if to whom is already obvious from context.

But for learners, the full version is best because it clearly shows:

• the thing liked: रंग
• the person: तुम्हें
• the command: चुनो

The comma is mainly there to make the two parts easier to read:

• जो रंग तुम्हें पसंद आया
• वह चुनो

It helps show the break between:

1. the descriptive clause
2. the main command

In Devanagari, punctuation is not always used exactly the way it is in English, so you may sometimes see the sentence written without a comma:

• जो रंग तुम्हें पसंद आया वह चुनो।

Both are understandable.

Yes.

• चुनो = choose
• चुन लो = choose it / go ahead and choose / choose for yourself

लो often adds a slight sense of:

• completion
• casual encouragement
• doing the action now

So:

• जो रंग तुम्हें पसंद आया, वह चुनो। = Choose the color you liked.
• जो रंग तुम्हें पसंद आया, वह चुन लो। = Go ahead and choose the color you liked.

Both are natural. चुन लो sounds a bit more conversational.